v4.4.0

• Fixed issue #13. Thanks to @wangyuew.
• fn/fx [version | semver] compare
  • Compare two semver versions. Function compares first argument with the second and returns >, < or =.
• string substring [count | frequency]: Frequency of a substring in a string. You may need character escaping, for example if string is 1.2.3 and substring is . then substring should be \. when passed to command.