Fix Generics handling

[outcatcher]

Fix issues

Simplified type parsing

Add tests

[codecov]

Codecov Report

Merging #3 into master will increase coverage by 7.5%.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #3     +/-   ##
=======================================
+ Coverage    92.5%   100%   +7.5%     
=======================================
  Files           4      4             
  Lines         120    117      -3     
=======================================
+ Hits          111    117      +6     
+ Misses          9      0      -9

Impacted Files	Coverage Δ
tyaml/types.py	100% <ø> (+10.34%)	⬆️
tyaml/loader.py	100% <100%> (+9.23%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update f8b4256...2a4c3f3. Read the comment docs.