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