correct typo in the authentication query to github

Author: freiric

Yesod/Auth/OAuth2/Github.hs

@@ -56,7 +56,7 @@ oauth2Github clientId clientSecret scopes = basicPlugin {apDispatch = dispatch}
  oauth = OAuth2
  { oauthClientId = encodeUtf8 clientId
  , oauthClientSecret = encodeUtf8 clientSecret
- , oauthOAuthorizeEndpoint = encodeUtf8 $ "https://github.com/login/oauth/authorize?scopes=" `T.append` T.intercalate "," scopes
+ , oauthOAuthorizeEndpoint = encodeUtf8 $ "https://github.com/login/oauth/authorize?scope=" `T.append` T.intercalate "," scopes
  , oauthAccessTokenEndpoint = "https://github.com/login/oauth/access_token"
  , oauthCallback = Nothing
  }