Add "schema" key for custom protocol expansions - fix #33

[issmirnov]

Also, clean up the test file structure a bit.

[codecov]

Codecov Report

Merging #34 (408d9de) into master (d08f192) will decrease coverage by 0.37%.
The diff coverage is 77.77%.

@@            Coverage Diff             @@
##           master      #34      +/-   ##
==========================================
- Coverage   52.17%   51.80%   -0.38%     
==========================================
  Files           4        4              
  Lines         230      222       -8     
==========================================
- Hits          120      115       -5     
+ Misses        103       99       -4     
- Partials        7        8       +1     

Impacted Files	Coverage Δ
text.go	81.66% <0.00%> (-1.67%)	⬇️
config.go	33.75% <66.66%> (+0.82%)	⬆️
web.go	90.69% <100.00%> (+0.22%)	⬆️
main.go	0.00% <0.00%> (ø)

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