update changelog for 5.1.0

update changelog and version for 5.0.2 release

Merge pull request SpinlockLabs#149 from DirectMyFile/maint1

update changelog, version to 5.0.1

Prepare to release v5

Add Code Search (SpinlockLabs#120)

* Add code search

* Don't parse code search results as users

* additional fixes for dart 2

* update doc string, remove TODO

* add a search example, use localstorage

* use consistent single quotes

* fix rate limit error handling

* made json_serializable .. not quite working yet

* fix up remaining issues

* simplify by using a completer, add comments

* make the return type a stream and make pages and perPage required

* cleanup
- add changelog entry
- remove example updates
- un required pages and perPage

* simplify
Don't do shenanigans with another stream controller, just map the stream from the pagination helper
This helps to limit network requests until consumers pull values
update the search example to use "await for"

* more cleaning, update changelog

* bump version to 4.1.0

* update to 4.1.0 in the changelog too

Merge pull request SpinlockLabs#129 from pq/4.0.1

4.0.1

Merge pull request SpinlockLabs#118 from DirectMyFile/version_bump_to_4

Update version for 4.0.0 release