v1.4.0

• update gitignore ad83ef8
• Merge pull request #9 from jmercha/master 8cfee98
• Update CI b4fc3bb
• Downgrade mocha a980e46
• Fix test 13249f8
• Update docs 2114934
• Preparing pull request 5a6ecae
• del semi 5f91f52
• Use delta E distance in tests, add mocha, fix memo 1fd76ce
• Add memoization, use deltaE 1201d45
• update repository url c83f32e

v1.3.0...vminor