Vcf module

[codecov-io]

Codecov Report

Merging #433 into master will increase coverage by <.01%. The diff coverage is 92.35%.

@@            Coverage Diff             @@
##           master     #433      +/-   ##
==========================================
+ Coverage   77.67%   77.67%   +<.01%     
==========================================
  Files         131      131              
  Lines        9571     9574       +3     
==========================================
+ Hits         7434     7437       +3     
  Misses       2137     2137

Impacted Files	Coverage Δ
src/var/vcf/writer.jl	100% <100%> (ø)	:arrow_up:
src/var/vcf/metainfo.jl	88.76% <100%> (ø)	:arrow_up:
src/var/bcf/writer.jl	94.44% <100%> (ø)	:arrow_up:
src/var/vcf/reader.jl	7.33% <75%> (+0.85%)	:arrow_up:
src/var/bcf/reader.jl	89.28% <83.33%> (+0.39%)	:arrow_up:
src/var/vcf/header.jl	92.59% <83.33%> (ø)	:arrow_up:
src/var/vcf/record.jl	85.21% <85.1%> (ø)	:arrow_up:
src/var/bcf/record.jl	85% <96.87%> (+0.04%)	:arrow_up:
src/intervals/interval.jl	91.89% <0%> (-1.36%)	:arrow_down:
src/align/alignment.jl	87.12% <0%> (+0.99%)	:arrow_up:

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[TransGirlCodes]

Everything looks good here. I'm happy to merge if you're done.

[bicycle1885]

I will add more docstrings for BCF soon.