v0.15.0: Ordered Lists is now Supported

• Update README (#127)
• Ordered list support (#122)
• Add configuration to enable ordered list (#117, @zsyed91 )
• Support Jekyll v3.9 and v4.1 / Modify workflow trigger event (#121)
• Bump paambaati/codeclimate-action from v2.4.0 to v2.7.4 (#126)