Change fileld field of records to Int

[jakobnissen]

The filled field of records is now an integer. Since it was always 1:n before, there is no reason it's not just n. Is based on #68

[codecov[bot]]

Codecov Report

Merging #69 (561deda) into release-2 (216ef45) will decrease coverage by 1.67%. The diff coverage is 72.22%.

@@              Coverage Diff              @@
##           release-2      #69      +/-   ##
=============================================
- Coverage      80.63%   78.95%   -1.68%     
=============================================
  Files             12       12              
  Lines            661      632      -29     
=============================================
- Hits             533      499      -34     
- Misses           128      133       +5     

Flag	Coverage Δ
unittests	78.95% <72.22%> (-1.68%)	:arrow_down:

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Impacted Files	Coverage Δ
src/fastq/record.jl	78.22% <63.33%> (-4.17%)	:arrow_down:
src/fasta/record.jl	59.37% <68.96%> (-5.88%)	:arrow_down:
src/fasta/readrecord.jl	96.42% <100.00%> (ø)
src/fastq/fastqread.jl	100.00% <100.00%> (ø)
src/fastq/readrecord.jl	46.15% <100.00%> (ø)

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[jakobnissen]

Superseded by #68