Fix SRR to GSM

[saketkc]

Closes #33
Fixes #24

[codecov]

Codecov Report

Merging #34 into master will increase coverage by 1.7%.
The diff coverage is 75%.

@@            Coverage Diff            @@
##           master      #34     +/-   ##
=========================================
+ Coverage   39.02%   40.72%   +1.7%     
=========================================
  Files           5        5             
  Lines         984      987      +3     
=========================================
+ Hits          384      402     +18     
+ Misses        600      585     -15

Impacted Files	Coverage Δ
pysradb/cli.py	0% <0%> (ø)	⬆️
pysradb/sraweb.py	85.34% <100%> (+3.67%)	⬆️

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