Update CHANGES.md, prepare for 0.11.1 release

[fingolfin]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.46%. Comparing base (2cf157c) to head (56121c1).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1000      +/-   ##
==========================================
- Coverage   75.78%   75.46%   -0.33%     
==========================================
  Files          51       50       -1     
  Lines        4204     4173      -31     
==========================================
- Hits         3186     3149      -37     
- Misses       1018     1024       +6     

Files	Coverage Δ
src/macros.jl	93.58% <ø> (-1.29%)	⬇️

... and 10 files with indirect coverage changes

[lgoettgens]

Maybe mention #991 as well?

[fingolfin]

Indeed, I somehow overlooked it. Added and also improved the @wrap docstring a bit

[ThomasBreuer]

Good.
In particular term "convert to GapObj" in the description of functions created by @wrap fits better; note that this conversion means in fact "unwrapping" for many Oscar objects.