Always use raise to signal exceptions

Gemfile

@@ -11,7 +11,7 @@ end
 group :test do
   gem 'coveralls'
   gem 'rspec', '>= 2.14'
-  gem 'rubocop', '>= 0.27'
+  gem 'rubocop', '>= 0.37'
   gem 'simplecov', '>= 0.9'
   gem 'timecop'
   gem 'webmock'

lib/twitter/null_object.rb

@@ -22,12 +22,12 @@ def respond_to?(*)
     end
 
     def instance_of?(klass)
-      fail(TypeError, 'class or module required') unless klass.is_a?(Class)
+      raise(TypeError, 'class or module required') unless klass.is_a?(Class)
       self.class == klass
     end
 
     def kind_of?(mod)
-      fail(TypeError, 'class or module required') unless mod.is_a?(Module)
+      raise(TypeError, 'class or module required') unless mod.is_a?(Module)
       self.class.ancestors.include?(mod)
     end
 

lib/twitter/rest/request.rb

@@ -78,7 +78,7 @@ def mime_type(basename)
 
       def fail_or_return_response_body(code, body, headers)
         error = error(code, body, headers)
-        fail(error) if error
+        raise(error) if error
         @rate_limit = Twitter::RateLimit.new(headers)
         body
       end

lib/twitter/streaming/response.rb

@@ -21,7 +21,7 @@ def <<(data)
 
       def on_headers_complete(_headers)
         error = Twitter::Error::ERRORS[@parser.status_code]
-        fail error if error
+        raise error if error
       end
 
       def on_body(data)