Make AuthInfo[+U] covariant
Merge pull request #29 from dbalduini/auth-covariant

Make AuthInfo[+U] covariant
version 0.9.1
Make client credentials optional for password grant.
Merge pull request #34 from ctoomey/client-cred-optional-for-password

Make client credentials optional password #33
version 0.10.0-SNAPSHOT
add supporting version to README.md #33
Refactoring
remove duplicate clientcredential parsing #35
modify optional clientSecret #36
update README.md #36

This commit will be merged after release
rename Option instance
add about AuthInfo #36
Merge branch 'optional-clientsecret'
version 0.10.0
modify README.md for 0.10.0