Install recipes from dev branches, add extras_require

[cisaacstern]

Closes #4

[codecov]

Codecov Report

Merging #8 (ef829b7) into main (3c694ac) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main        #8   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           31        35    +4     
=========================================
+ Hits            31        35    +4     

Impacted Files	Coverage Δ
meta_yaml_schema/schema.py	100.00% <100.00%> (ø)

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.