Merge pull request #1638 from dexidp/readme

Update readme

README.md

 # dex - A federated OpenID Connect provider
 
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 ![logo](Documentation/logos/dex-horizontal-color.png)
 
@@ -69,7 +69,8 @@ Dex implements the following connectors:
 | [GitHub](Documentation/connectors/github.md) | yes | yes | yes | stable | |
 | [SAML 2.0](Documentation/connectors/saml.md) | no | yes | no | stable |
 | [GitLab](Documentation/connectors/gitlab.md) | yes | yes | yes | beta | |
-| [OpenID Connect](Documentation/connectors/oidc.md) | yes | no ([#1065][issue-1065]) | no | beta | Includes Google, Salesforce, Azure, etc. |
+| [OpenID Connect](Documentation/connectors/oidc.md) | yes | no ([#1065][issue-1065]) | no | beta | Includes Salesforce, Azure, etc. |
+| [Google](Documentation/connectors/google.md) | yes | yes | yes | alpha | |
 | [LinkedIn](Documentation/connectors/linkedin.md) | yes | no | no | beta | |
 | [Microsoft](Documentation/connectors/microsoft.md) | yes | yes | no | beta | |
 | [AuthProxy](Documentation/connectors/authproxy.md) | no | no | no | alpha | Authentication proxies such as Apache2 mod_auth, etc. |