fix ignore list

Author: markburns

lib/problematic_variable_finder/gem_problems.rb

@@ -53,7 +53,7 @@ def ignore_gem?(name)
     delegate :options, to: ProblematicVariableFinder
 
     def ignore_list
-      @ignore_list ||= ProblematicVariableFinder.read_file(File.expand_path('DEFAULT_IGNORED_GEMS', __dir__)).map(&:strip)
+      @ignore_list ||= ProblematicVariableFinder.read_file(File.expand_path('DEFAULT_IGNORED_GEMS', __dir__)).split("\n").map(&:strip)
     end
 
     def outdated_gems