v0.1.0

This version introduces the very basic functionality for validating OpenAPI v3 specs.

Total issues resolved: 4

• 1: Reformat according to PEP8 thanks to @rdohms
• 2: Improve output of validation thanks to @rdohms
• 3: Add Circle-CI configuration thanks to @lcobucci
• 4: Load external specs through http and https thanks to @kejwmen