Add check_description flag

[carlobaldassi]

Allows to suppress the description length warning.
Closes #14

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.

Project coverage is 94.16%. Comparing base (4c0991f) to head (6315667).
Report is 10 commits behind head on master.

Files with missing lines	Patch %	Lines
src/FastaIO.jl	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #15      +/-   ##
==========================================
+ Coverage   91.82%   94.16%   +2.33%     
==========================================
  Files           1        1              
  Lines         208      240      +32     
==========================================
+ Hits          191      226      +35     
+ Misses         17       14       -3     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.