Google user creation json value change

[DinithHerath]

From https://developers.google.com/identity/sign-in/web/backend-auth#calling-the-tokeninfo-endpoint, google has changed the first_name and last_name parameters to the following.

{
"iss": "https://accounts.google.com",
"sub": "110169484474386276334",
"azp": "1008719970978-hb24n2dstb40o45d4feuo2ukqmcc6381.apps.googleusercontent.com",
"aud": "1008719970978-hb24n2dstb40o45d4feuo2ukqmcc6381.apps.googleusercontent.com",
"iat": "1433978353",
"exp": "1433981953",

// These seven fields are only included when the user has granted the "profile" and
// "email" OAuth scopes to the application.
"email": "testuser@gmail.com",
"email_verified": "true",
"name" : "Test User",
"picture": "https://lh4.googleusercontent.com/-kYgzyAWpZzJ/ABCDEFGHI/AAAJKLMNOP/tIXL9Ir44LE/s99-c/photo.jpg",
"given_name": "Test",
"family_name": "User",
"locale": "en"
}

Can you please add that to your package? I have added #13 as a pull request to this.
Thanks.