Moved back to version scheme for development

[jmwright]

This moves us back to the dev versioning for the next release cycle, and fixes the lack of highlighting of the current version header in the changelog.

[codecov]

Codecov Report

Merging #1360 (30cb654) into master (8e7eb30) will not change coverage.
The diff coverage is 0.00%.

❗ Current head 30cb654 differs from pull request most recent head 6f81e03. Consider uploading reports for the commit 6f81e03 to get more accurate results

@@           Coverage Diff           @@
##           master    #1360   +/-   ##
=======================================
  Coverage   94.16%   94.16%           
=======================================
  Files          26       26           
  Lines        5584     5584           
  Branches      954      954           
=======================================
  Hits         5258     5258           
  Misses        194      194           
  Partials      132      132           

Impacted Files	Coverage Δ
cadquery/__init__.py	87.50% <0.00%> (ø)

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[adam-urbanczyk]

Thanks @jmwright !