chrono replaced with time, local_offset feature flag added

[jasonozias]

• chrono has been replace with time as the time crate is better maintained.
• Added a local_offset feature flag. Using this will enable the local timezone features in the git and build features. However, due to a potential segfault in the time crate, you must also explicitly opt in to the unsoundness by setting RUSTFLAGS="--cfg unsound_local_offset". Per the time crate docs, this is untested, so use with extreme caution.

[codecov]

Codecov Report

Merging #110 (f151bf7) into master (e9efb23) will increase coverage by 0.80%.
The diff coverage is 90.56%.

@@            Coverage Diff             @@
##           master     #110      +/-   ##
==========================================
+ Coverage   96.93%   97.73%   +0.80%     
==========================================
  Files          11       11              
  Lines         980      973       -7     
==========================================
+ Hits          950      951       +1     
+ Misses         30       22       -8     

Impacted Files	Coverage Δ
src/feature/mod.rs	100.00% <ø> (ø)
src/gen.rs	100.00% <ø> (+1.15%)	⬆️
src/feature/git.rs	86.66% <82.14%> (+0.24%)	⬆️
src/config.rs	100.00% <100.00%> (ø)
src/feature/build.rs	100.00% <100.00%> (+8.77%)	⬆️

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