[MRG + 1] Add __main__

[pqrth]

Closes #154

[codecov-io]

Codecov Report

Merging #159 into master will decrease coverage by 0.49%.
The diff coverage is 0%.

@@           Coverage Diff            @@
##           master    #159     +/-   ##
========================================
- Coverage   84.89%   84.4%   -0.5%     
========================================
  Files          12      13      +1     
  Lines        1205    1212      +7     
  Branches      289     290      +1     
========================================
  Hits         1023    1023             
- Misses        139     146      +7     
  Partials       43      43

Impacted Files	Coverage Δ
camelot/__main__.py	0% <0%> (ø)

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[vinayak-mehta]

@pqrth Thanks for the contribution!