Vendor version.py to avoid relying on Param

[maximlt]

Param was just used as a build dependency for its version.py module (autover). Colorcet can just vendor version.py.

[codecov-commenter]

Codecov Report

Merging #84 (e904ce5) into master (b1c7c1f) will decrease coverage by 10.03%. The diff coverage is 38.87%.

@@             Coverage Diff             @@
##           master      #84       +/-   ##
===========================================
- Coverage   95.82%   85.78%   -10.04%     
===========================================
  Files           7        8        +1     
  Lines        1579     1914      +335     
===========================================
+ Hits         1513     1642      +129     
- Misses         66      272      +206     

Impacted Files	Coverage Δ
colorcet/version.py	38.50% <38.50%> (ø)
colorcet/__init__.py	99.28% <100.00%> (ø)

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