Docs fix

[illusional]

This card to fix file export examples on readme. This card closes #28.

[codecov]

Codecov Report

Merging #29 into master will decrease coverage by 0.09%.
The diff coverage is 50%.

@@            Coverage Diff            @@
##           master      #29     +/-   ##
=========================================
- Coverage      82%   81.91%   -0.1%     
=========================================
  Files          10       10             
  Lines         678      680      +2     
=========================================
+ Hits          556      557      +1     
- Misses        122      123      +1

Impacted Files	Coverage Δ
cwlgen/requirements.py	75.34% <50%> (-0.36%)	⬇️

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