Rubocop syntax 2.3

.rubocop.yml

@@ -5,8 +5,8 @@ require:
 inherit_from: .rubocop_todo.yml
 AllCops:
-  TargetRubyVersion: 2.1
-  # Cop names are not displayed in offense messages by default. Change behavior
+  TargetRubyVersion: 2.3
+  # Cop names are not d§splayed in offense messages by default. Change behavior
   # by overriding DisplayCopNames, or by giving the -D/--display-cop-names
   # option.
   DisplayCopNames: true
@@ -192,6 +192,9 @@ Style/FlipFlop:
 Style/For:
   Enabled: true
+# Checks if there is a magic comment to enforce string literals
+Style/FrozenStringLiteralComment:
+  Enabled: false
 # Do not introduce global variables.
 Style/GlobalVars:
   Enabled: true