Update README.md

Steve Peak · web-flow · commit ef8c461aa9f2 · 2016-06-21T08:23:48.000-07:00
diff --git a/README.md b/README.md
@@ -20,7 +20,7 @@ Codecov can be ran from inside your `tox.ini` please make sure you pass all the
 
 ```
 [testenv]
-passenv = CI TRAVIS_BUILD_ID TRAVIS TRAVIS_BRANCH TRAVIS_JOB_NUMBER TRAVIS_PULL_REQUEST TRAVIS_JOB_ID TRAVIS_REPO_SLUG TRAVIS_COMMIT
+passenv = CI TRAVIS TRAVIS_*
 deps = codecov>=1.4.0
 commands = codecov -e TOXENV
 ```
