feat: 1.10.5 release with relaxed ruby dependency (>= 2.1)

feat: 1.10.4 release with ruby-saml ~> 1.17

fix: revert required_ruby_version to >=2.4 for 2.1.2

Closes #228

fix: file permissions for version.rb and CHANGELOG

Closes #226

feat: new release 2.2.0

Merge pull request #224 from omniauth/feat/new-release-2.1.0

feat: new release 2.1.0

Bump version to v2.1.0

Release v1.10.3

Release v1.10.2