Merge pull request #10 from andys8/bugfix/4_no_login_error

Show login error message if credentials are wrong

src/Page/Login.elm

@@ -187,7 +187,8 @@ modelValidator =
 
 errorsDecoder : Decoder (List String)
 errorsDecoder =
-    decode (\email username password -> List.concat [ email, username, password ])
+        decode (\emailOrPassword email username password -> List.concat [ emailOrPassword, email, username, password ])
+        |> optionalError "email or password"
         |> optionalError "email"
         |> optionalError "username"
         |> optionalError "password"