Issue 246- Allow template from local repo

[seleniusmoell]

Added a new option --template_path to cruft update

From issue description: "Introduce an argument to update (and link?) --template_path to use a template that has already been checked out locally. This will help to use cruft inside secure github workflows when you do not want to pass private tokens or username and passwords."

[codecov[bot]]

Codecov Report

Patch coverage: 96.61% and project coverage change: -0.19 :warning:

Comparison is base (56eedcb) 99.69% compared to head (fc1935f) 99.50%.

:exclamation: Current head fc1935f differs from pull request most recent head efa07d1. Consider uploading reports for the commit efa07d1 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #247      +/-   ##
==========================================
- Coverage   99.69%   99.50%   -0.19%     
==========================================
  Files          21       21              
  Lines         979     1008      +29     
==========================================
+ Hits          976     1003      +27     
- Misses          3        5       +2     

Impacted Files	Coverage Δ
cruft/_cli.py	100.00% <ø> (ø)
cruft/_commands/utils/cookiecutter.py	96.07% <84.61%> (-3.93%)	:arrow_down:
cruft/_commands/create.py	100.00% <100.00%> (ø)
cruft/_commands/update.py	98.41% <100.00%> (+0.05%)	:arrow_up:
tests/test_api.py	100.00% <100.00%> (ø)
tests/test_cli.py	100.00% <100.00%> (ø)

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[guilhermecgs]

I would love this PR working

[guilhermecgs]

@seleniusmoell did you have a working version on this?

[seleniusmoell]

@guilhermecgs Sorry, I had to put this on hold before I got a finished version