License: name the file properly

It is not Markdown, this rename will lead to a clearer display of the file
Fix a typo calling stdout.write
.gitignore node_modules
Merge pull request #1 from denis-sokolov/license-fix

License: name the file properly
Merge pull request #4 from denis-sokolov/fix-binary-10

Fix a typo calling stdout.write
Merge pull request #3 from denis-sokolov/ignore-file

.gitignore node_modules
Use argparse for better cli usage