add ngens for FreeAssAlgebra

[lgoettgens]

Closes #1294

[codecov]

Codecov Report

Merging #1295 (712bdff) into master (8aefeec) will increase coverage by 0.03%.
The diff coverage is 84.61%.

@@            Coverage Diff             @@
##           master    #1295      +/-   ##
==========================================
+ Coverage   85.51%   85.55%   +0.03%     
==========================================
  Files         102      102              
  Lines       27987    27973      -14     
==========================================
- Hits        23932    23931       -1     
+ Misses       4055     4042      -13     

Impacted Files	Coverage Δ
src/Rings.jl	51.78% <0.00%> (-2.94%)	⬇️
src/generic/MPoly.jl	94.97% <ø> (+0.05%)	⬆️
src/generic/NCPoly.jl	61.00% <ø> (-0.96%)	⬇️
src/generic/Poly.jl	98.75% <ø> (-0.03%)	⬇️
src/NCRings.jl	89.13% <66.66%> (-1.78%)	⬇️
src/MPoly.jl	78.30% <90.00%> (+0.82%)	⬆️
src/AbstractAlgebra.jl	51.56% <100.00%> (ø)
src/NCPoly.jl	90.05% <100.00%> (+0.64%)	⬆️
src/Poly.jl	93.12% <100.00%> (+0.27%)	⬆️
src/generic/FreeAssAlgebra.jl	99.70% <100.00%> (+<0.01%)	⬆️
... and 1 more

... and 6 files with indirect coverage changes

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[thofma]

Thanks!