Modified url for old release

• Modified go.mod file to show current location of module
• Modified imports to reflect correct module location

0.4.0 8/30/2017

• Refactored acquirer code to be more flexible/extendable
• Gave examples their own go.mod files so the library doesn't have unnecessary dependencies.

0.3.1 7/17/2019

• Fix travis yaml
• Added delimiter option for constructor

0.3.0 7/12/2019

• Added Auth for outgoing requests
• Added jwt Validator
• Removed SermoDigital dependency
• Added documentation and examples
• Moved all packages up one folder

0.2.5 5/9/2019

• Added Error Response Reason

0.2.4 4/26/2019

• Removed tip builds from travis
• Added unit tests
• Added more descriptive errors
• Changed StatusUnauthorized to StatusForbidden

0.2.3 4/16/2019

• Fixed Errors Error() function

0.2.2 4/15/2019

• Updated Errors Error() function
• Added request URL and method to context

0.2.1 4/12/2019

• Removed request from logging statements

0.2.0 4/11/2019

• Added checks
• Added configurable behavior on a key not found in enforcer
• Fixed error message in a check
• Added logging to constructor and enforcer