Allow decoration and various bug fixes / improvements

Woo! A new release! A lot of nice, small details

• #131 Config options added for azure - thanks to @aeimer
• #135 Fix missing base_url option for Drupal provider - thanks to @mnugter
• #137 Allow service decoration so client objects can be extended - thanks to @sadikoff
• #129 Avoid clearing state from session after reading it - thanks to @weaverryan

New http_client option and minor bug fixes

Another release! Go bundle go! Minor stuff:

• #86 Configurable HttpClient - thanks to @soullivaneuh
• #118 Fix strange fatal error edge case - thanks to @weaverryan

Minor option additions

• #114 Add configurable option to use oidc mode for the Google Provider thanks to @hansnilsson
• #117 Missing account config key for Auth0 thanks to @8eph

Remove state from session after using it

A new release!

This introduces a small change in #106: the state is removed from the session after being used.

Updated Facebook SDK Version Config

A quick & easy release!

• #91 For the facebook client, the graph_api_version is now required. It previously
  defaulted to v2.5.

1.18.0: update Discord client

• [BC Break] If you're using the "discord" client, we've migrated to use a newer, not abandoned client - see #90

v1.17.0: Handle more OAuth Errors

I love releases!

Highlights:

• The SocialAuthenticator now handles 2 other common error situations #80
• Fix missing use statement for GitlabResourceOwner #76

Fixing issue with config client merging

• Fix merging config from multiple files (#75)

New UserProvider for simple, non-persisted setups

• Add simple user provider #72

Fix for Keycloak

• Fix for Keycloak: #71