v0.5.1: Fix invalid credentials error. (#10)

- Added expiration to GithubClient so they can be rotated when they expire. This became a problem when handed a 'hot lambda' (reused container) because the clients are cached. Should now be solved.
- Fixed .travis.yml so that it runs tests after making a release. After because we are testing terraform also, which requires a zip file as input.

v0.5.0: Made org/username case insensitive.

• Fixed schedule for trigger.
• Made org/username case insensitive (since Github is also).

v0.4.0: Support a 30min trigger schedule but only rotate keys every 7 days. (#7)

* Change trigger schedule to every 30 min.

* Only rotate key if it is older than 7 days and/or the permissions have changed.

v0.3.0: Switch to using Github Apps instead of user access tokens.

* We are now using Github Apps instead of a user access token to interact with the Github API. 

* Added support for passing Github credentials securely to the Lambda.

* Bumped all dependencies.

v0.2.0: Use secrets manager instead of SSM (#4)

* Switch to secrets manager.

* Update makefile to also run terraform tests.

* Update Readme.

v0.1.5

Expect a "boolean" string in readOnly. Since we are using terraform...

v0.1.4

Log errors instead of returning them. So one misconfigured repo does …

v0.1.3

Add md5 of config to event rule name so changes trigger the lambda.

v0.1.2

Woops. Should not log the private key to cloudwatch :)

v0.1.1

Make sure Github trigger does not conflict with STS.