v1.3.2

• Faster total_set using unpack1/count instead of Kernighan's loop
• Removed deprecated test_files from gemspec
• Added required_ruby_version >= 2.1
• Updated README compatibility note and copyright year

v1.3.0 - Clean up and a small perf boost

Not writing a lot here, I just wanted to put a stick in the sand with this being a proper release of a very little used library :-)