Version 1.6.7

• Commands: Added run_* methods as an alternative to modifiers #386
• CLI: Added support for ALLOW_ABREV #401
• CLI: Added DESCRIPTION_MORE, preserves spacing #378
• Color: Avoid throwing error in atexit in special cases (like pytest) #393
• Including Python 3.7 in testing matrix.
• Smaller bugfixes and other testing improvements.