Fix parsing comma-separated number in region

[totakke]

Adds support of comma-separated number in region.

(region/parse-region "chr1:1,000-2,000")
;;=> {:chr "chr1", :start 1000, :end 2000}

SAMtools also supports such numbers.

5. A region should be presented in one of the following formats:
   `chr1', `chr2:1,000' and `chr3:1000-2,000'. When a region is
   specified, the input alignment file must be a sorted and indexed
   alignment (BAM/CRAM) file.

[codecov]

Codecov Report

Merging #111 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master    #111   +/-   ##
======================================
  Coverage    85.5%   85.5%           
======================================
  Files          62      62           
  Lines        4085    4085           
  Branches      399     399           
======================================
  Hits         3493    3493           
  Misses        193     193           
  Partials      399     399

Impacted Files	Coverage Δ
src/cljam/util/region.clj	100% <100%> (ø)	⬆️

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[alumi]

Merged. Thank you for the fix 👍