v2.6.4

Added assertions

• e164 - The international public telecommunication numbering plan
• interfaceExists
• ip / ipv4 / ipv6
• keyNotExists
• null
• satisfy - Allows for a bespoke assertion, rather than a predefined one.

Fixes

• Improved the reporting of the value for min and max assertions.

Other changes

• Removed composer.lock file from library
• Improved travis build to detect incorrect documentation changes