add monkey patch

Author: markburns

lib/problematic_variable_finder.rb

@@ -5,6 +5,7 @@
 
 require "problematic_variable_finder/runner"
 require "problematic_variable_finder/main_finder"
+require "problematic_variable_finder/monkey_patches"
 
 module ProblematicVariableFinder
   class << self

lib/problematic_variable_finder/monkey_patches.rb

@@ -0,0 +1,6 @@
+class Parser::Builders::Default
+  # More details here https://github.com/whitequark/parser/issues/283
+  def string_value(token)
+    value(token)
+  end
+end