Removed deprecated 'gen' and 'ConstantsFlags'

[CraZySacX]

• Removed deprecated gen function
• Removed deprecated ConstantsFlags bitflags

[codecov]

Codecov Report

Merging #53 (7e04892) into master (bf86b11) will increase coverage by 0.47%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           master       #53      +/-   ##
===========================================
+ Coverage   99.52%   100.00%   +0.47%     
===========================================
  Files          10        10              
  Lines         851       552     -299     
===========================================
- Hits          847       552     -295     
+ Misses          4         0       -4     

Impacted Files	Coverage Δ
src/config.rs	100.00% <ø> (ø)
src/constants.rs	100.00% <ø> (ø)
src/error.rs	100.00% <ø> (ø)
src/feature/build.rs	100.00% <ø> (ø)
src/feature/cargo.rs	100.00% <ø> (ø)
src/feature/git.rs	100.00% <ø> (+2.18%)	⬆️
src/feature/mod.rs	100.00% <ø> (ø)
src/feature/rustc.rs	100.00% <ø> (ø)
src/lib.rs	100.00% <ø> (ø)
src/gen.rs	100.00% <100.00%> (ø)
... and 1 more

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