feat: add method to get version number

[sebbsan]

Summary

added method that returns the version of this SDK

Description

This was necessary to remove dependency in sphere-node-utils to an unmaintained library that introduces vulnerabilities

Todo

• Tests
  • [x ] Unit
  • [x ] Integration
  • [x ] Acceptance
• Documentation

[LEQADA]

@sebbsan do I understand correct that you want to remove some of the dependencies of sphere-node-sdk in the sphere-node-utils if version of the first one is lower than some N?

[sebbsan]

@LEQADA the problem is this code here which I want to replace with this API method:
https://github.com/sphereio/sphere-node-utils/blob/e39b07a188b081346b348bcf31ab95349e300ce4/src/coffee/helpers/user-agent.coffee#L6

the dependency load-module-pkg introduces a vulnerability + hasn't been maintained for 2 years.
So once we release a new version of this, I can make a new version of sphere-node-utils

[daern91]

Thanks a lot for the PR. I first didn't understand why we needed this but after reading your response to @LEQADA I think it makes sense.

[coveralls]

Coverage increased (+0.003%) to 97.669% when pulling d4588d1 on AddMethodToReturnVersion#301 into f8d8c13 on master.

[sebbsan]

@LEQADA @daern91 and after we have a new version of sphere-node-utils we need a new version of this one again. There is a circular dependency..