Update release notes from some previous PRs

[eric-wieser]

https://external-builds.readthedocs.io/html/galgebra/146/changelog.html

Adds release notes for:

• Raise TypeError for bad arguments to Mv #80
• Correct information about blades of grade 0 #90
• Be stricter about kwargs to Mv.__init__ #97
• Fold the exclusions of scalars from the hestenes dot product into the table #134
• Remove assignments to mv.obj #141

[codecov]

Codecov Report

Merging #146 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #146   +/-   ##
======================================
  Coverage    67.2%   67.2%           
======================================
  Files           8       8           
  Lines        4769    4769           
======================================
  Hits         3205    3205           
  Misses       1564    1564

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