Fix Style/ParenthesesAroundCondition, Style/AndOr and Style/Not

Fixes:
* Style/ParenthesesAroundCondition: Don't use parentheses around the condition of an unless.
* Style/AndOr: Use && instead of and.
* Style/Not: Use ! instead of not.

fastlane/lib/assets/custom_action_template.rb

@@ -39,7 +39,7 @@ def self.available_options
                                        # a short description of this parameter
                                        description: 'API Token for [[NAME_CLASS]]',
                                        verify_block: proc do |value|
-                                         unless (value and not value.empty?)
+                                         unless value && !value.empty?
                                            UI.user_error!("No API token for [[NAME_CLASS]] given, pass using `api_token: 'token'`")
                                            # UI.user_error!("Couldn't find file at path '#{value}'") unless File.exist?(value)
                                          end