Add specs for authentication

README.md

@@ -104,7 +104,7 @@ and return a response object containing the data and other associated request in
     Clip creation counts for a second limit (duration currently unknown).
 *   **pagination** is a hash that appears when data can be traversed,
     and contains one member (*cursor*) which lets you paginate through certain requests.
-*   **raw** is the raw HTTP response data when `with_raw` is true in the client.
+*   **raw** is the raw HTTP response data.
 
 ```ruby
 # Get top live streams

lib/twitch/api_error.rb

@@ -12,7 +12,7 @@ def initialize(status_code, body)
       @status_code = status_code
       @body = body
 
-      super "The server returned error #{status_code}"
+      super self.body['message']
     end
   end
 end

lib/twitch/client.rb

@@ -50,7 +50,7 @@ class Client
     # - redirect_uri [String] A redirect URI.
     # Used for redirection after successful authentication.
     # - scopes [Array<String>] Required scopes.
-    # Used for possibility to make planned requests.
+    # Used to specify permissions for the token.
     # - token_type [Symbol] Access Token type.
     # Used for behavior with given tokens and on requests.
     # - access_token [String] An access token.