Fix the rst markup on the Changelog. (gidgethub#197)

Add .DS_Store to .gitignore file

Set Sphinx language setting to "en", to make it compatible with Sphin…

…x v5

Release v5.1.0

Release v 5.0.1

Bump the version to 5.0.1 in __init__.py

Release v5.0.0

Allow passing content-type header to GitHubAPI.POST (gidgethub#131)

* Allow passing content-type header to GitHubAPI.POST

When the content-type is passed, the raw body is used in the request.
The default content-type is json, and the body would be parsed to JSON format.

Updated documentation and changelog.

Closes gidgethub#115

Co-authored-by: Brett Cannon <[email protected]>

Prep for 4.1.1 release (gidgethub#126)

Release 4.1.0

Try using RTD's default theme