v1.2.1

Features

• Add nyc setup file and package.json script.
• Add mocha setup file.
• Add tests for custom cows and modes management.
• Reference to original source code in README.md.
• Update dependencies.

Fixed

• Some cows designs have been fixed.
• Box generation for empty messages.
• Test script has been improved.

To do

• Fix tests.
• Setup CI.