load module from pythonpath

[drmorr0]

Description

This allows users to specify a skill module to import from your PYTHONPATH, by adding the "module" key to their configuration.yaml.

Fixes #661

Status

READY

Type of change

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update
• Documentation (fix or adds documentation)

How Has This Been Tested?

Added new tests, and tested locally.

Checklist:

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation (if applicable)
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[jacobtomlinson]

Many thanks for this.

It looks like ModuleNotFoundError is a python 3.6+ feature. In opsdroid we support 3.5+. Could you please rework this to support 3.5.

[codecov]

Codecov Report

Merging #755 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #755   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          28     28           
  Lines        1843   1847    +4     
=====================================
+ Hits         1843   1847    +4

Impacted Files	Coverage Δ
opsdroid/loader.py	100% <100%> (ø)	⬆️

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