Updated dependencies to use ruby2ruby 2.0.2 and ruby_parser 3.1.1 to avoid version conflict with ruby2ruby when using 2.0.2.
Merge pull request #130 from geoffharcourt/ruby_parser_3_1

Updated dependencies to use ruby2ruby 2.0.2 and ruby_parser 3.1.1
Added smell for nil checks
Merge pull request #131 from troessner/AddCheckNilSmell

Added smell for nil checks
Bump version to 1.3.1.