Release 2.2.0

• Deprecate Python 2.7 and 3.5
• Command substitution with backticks (PeterSufliarsky)
• Better chmod command line parsing (PeterSufliarsky)
• Add uniq command (PeterSufliarsky)
• Enhanced command substitution functionality.
• Fix nc hang
• Rename built-in user richard to phil, it's used as detection mechanism.
• Binary suppport for cat, grep and other commands
• Azure Sentinel output plugin