github
diff --git a/‎README.md
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diff --git a/‎config/_default_shared.yml
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@@ -2,11 +2,16 @@
 
 This repository provides recommended RuboCop configuration and additional Cops for use on GitHub open source and internal Ruby projects.
 
-## Installation
+## Usage
+
+Rubocop 0.68 removed performance cops and 0.72 removed Rails cops. However, upgrading `rubocop-github` without modification will almost definitely create very many new offenses. The current version of this gem exposes the "legacy" configuration under `config/default.yml` and `config/rails.yml` which should be used *if and only if* the version of rubocop is locked to `< 0.68` in your project (which it should be unless you `bundle update rubocop`). It also exposes an "edge" configuration under `config/default_edge.yml` and `config/rails_edge.yml` so that the changes can be tested without introducing breaking changes.
+
+### Legacy usage
 
 **Gemfile**
 
 ``` ruby
+gem "rubocop", "< 0.68"
 gem "rubocop-github"
 ```
 
@@ -19,6 +24,25 @@ inherit_gem:
     - config/rails.yml
 ```
 
+### Edge usage
+
+**Gemfile**
+
+``` ruby
+gem "rubocop-github"
+gem "rubocop-performance", require: false
+gem "rubocop-rails", require: false
+```
+
+**.rubocop.yml**
+
+``` yaml
+inherit_gem:
+  rubocop-github:
+    - config/default_edge.yml
+    - config/rails_edge.yml
+```
+
 ## Testing
 
 `bundle install`
 
@@ -0,0 +1,325 @@
+require: rubocop/cop/github
+
+# These cops are compatible across supported versions of rubocop
+
+Bundler/DuplicatedGem:
+  Enabled: true
+
+Bundler/OrderedGems:
+  Enabled: true
+
+Layout/BlockAlignment:
+  Enabled: true
+
+Layout/BlockEndNewline:
+  Enabled: true
+
+Layout/ConditionPosition:
+  Enabled: true
+
+Layout/DefEndAlignment:
+  Enabled: true
+
+Layout/EndAlignment:
+  Enabled: false
+
+Layout/EndOfLine:
+  Enabled: true
+
+Layout/InitialIndentation:
+  Enabled: true
+
+Layout/SpaceAfterColon:
+  Enabled: true
+
+Layout/SpaceAfterComma:
+  Enabled: true
+
+Layout/SpaceAfterMethodName:
+  Enabled: true
+
+Layout/SpaceAfterNot:
+  Enabled: true
+
+Layout/SpaceAfterSemicolon:
+  Enabled: true
+
+Layout/SpaceAroundBlockParameters:
+  Enabled: true
+
+Layout/SpaceAroundEqualsInParameterDefault:
+  Enabled: true
+
+Layout/SpaceBeforeBlockBraces:
+  Enabled: true
+
+Layout/SpaceInsideArrayLiteralBrackets:
+  Enabled: true
+  EnforcedStyle: no_space
+
+Layout/SpaceInsideArrayPercentLiteral:
+  Enabled: true
+
+Layout/SpaceInsideBlockBraces:
+  Enabled: true
+
+Layout/SpaceInsideParens:
+  Enabled: true
+
+Layout/SpaceInsideRangeLiteral:
+  Enabled: true
+
+Layout/SpaceInsideReferenceBrackets:
+  Enabled: true
+
+Layout/Tab:
+  Enabled: true
+
+Layout/TrailingBlankLines:
+  Enabled: true
+
+Layout/TrailingWhitespace:
+  Enabled: true
+
+Lint/CircularArgumentReference:
+  Enabled: true
+
+Lint/Debugger:
+  Enabled: true
+
+Lint/DeprecatedClassMethods:
+  Enabled: true
+
+Lint/DuplicateMethods:
+  Enabled: true
+
+Lint/DuplicatedKey:
+  Enabled: true
+
+Lint/EachWithObjectArgument:
+  Enabled: true
+
+Lint/ElseLayout:
+  Enabled: true
+
+Lint/EmptyEnsure:
+  Enabled: true
+
+Lint/EmptyInterpolation:
+  Enabled: true
+
+Lint/EndInMethod:
+  Enabled: true
+
+Lint/EnsureReturn:
+  Enabled: true
+
+Lint/FlipFlop:
+  Enabled: true
+
+Lint/FloatOutOfRange:
+  Enabled: true
+
+Lint/FormatParameterMismatch:
+  Enabled: true
+
+Lint/LiteralAsCondition:
+  Enabled: true
+
+Lint/LiteralInInterpolation:
+  Enabled: true
+
+Lint/Loop:
+  Enabled: true
+
+Lint/NextWithoutAccumulator:
+  Enabled: true
+
+Lint/RandOne:
+  Enabled: true
+
+Lint/RequireParentheses:
+  Enabled: true
+
+Lint/RescueException:
+  Enabled: true
+
+Lint/StringConversionInInterpolation:
+  Enabled: true
+
+Lint/UnderscorePrefixedVariableName:
+  Enabled: true
+
+Lint/UnneededCopDisableDirective:
+  Enabled: true
+
+Lint/UnneededSplatExpansion:
+  Enabled: true
+
+Lint/UnreachableCode:
+  Enabled: true
+
+Lint/UselessComparison:
+  Enabled: true
+
+Lint/UselessSetterCall:
+  Enabled: true
+
+Lint/Void:
+  Enabled: true
+
+Metrics/AbcSize:
+  Enabled: false
+
+Metrics/BlockLength:
+  Enabled: false
+
+Metrics/BlockNesting:
+  Enabled: false
+
+Metrics/ClassLength:
+  Enabled: false
+
+Metrics/CyclomaticComplexity:
+  Enabled: false
+
+Metrics/LineLength:
+  Enabled: false
+
+Metrics/MethodLength:
+  Enabled: false
+
+Metrics/ModuleLength:
+  Enabled: false
+
+Metrics/ParameterLists:
+  Enabled: false
+
+Metrics/PerceivedComplexity:
+  Enabled: false
+
+Naming/AsciiIdentifiers:
+  Enabled: true
+
+Naming/ClassAndModuleCamelCase:
+  Enabled: true
+
+Naming/FileName:
+  Enabled: true
+
+Naming/MethodName:
+  Enabled: true
+
+Performance/CaseWhenSplat:
+  Enabled: false
+
+Performance/Count:
+  Enabled: true
+
+Performance/Detect:
+  Enabled: true
+
+Performance/DoubleStartEndWith:
+  Enabled: true
+
+Performance/EndWith:
+  Enabled: true
+
+Performance/FlatMap:
+  Enabled: true
+
+Performance/RangeInclude:
+  Enabled: false
+
+Performance/RedundantMatch:
+  Enabled: false
+
+Performance/RedundantMerge:
+  Enabled: true
+  MaxKeyValuePairs: 1
+
+Performance/ReverseEach:
+  Enabled: true
+
+Performance/Size:
+  Enabled: true
+
+Performance/StartWith:
+  Enabled: true
+
+Security/Eval:
+  Enabled: true
+
+Style/ArrayJoin:
+  Enabled: true
+
+Style/BeginBlock:
+  Enabled: true
+
+Style/BlockComments:
+  Enabled: true
+
+Style/CaseEquality:
+  Enabled: true
+
+Style/CharacterLiteral:
+  Enabled: true
+
+Style/ClassMethods:
+  Enabled: true
+
+Style/Copyright:
+  Enabled: false
+
+Style/DefWithParentheses:
+  Enabled: true
+
+Style/EndBlock:
+  Enabled: true
+
+Style/For:
+  Enabled: true
+
+Style/FrozenStringLiteralComment:
+  Enabled: true
+
+Style/HashSyntax:
+  Enabled: true
+  EnforcedStyle: ruby19_no_mixed_keys
+
+Style/LambdaCall:
+  Enabled: true
+
+Style/MethodCallWithoutArgsParentheses:
+  Enabled: true
+
+Style/MethodDefParentheses:
+  Enabled: true
+
+Style/MultilineIfThen:
+  Enabled: true
+
+Style/NilComparison:
+  Enabled: true
+
+Style/Not:
+  Enabled: true
+
+Style/OneLineConditional:
+  Enabled: true
+
+Style/RedundantSortBy:
+  Enabled: true
+
+Style/Sample:
+  Enabled: true
+
+Style/StabbyLambdaParentheses:
+  Enabled: true
+
+Style/Strip:
+  Enabled: true
+
+Style/StringLiterals:
+  Enabled: true
+  EnforcedStyle: double_quotes