Add to awesome-go!

[soypat]

pctl is missing here https://github.com/avelino/awesome-go#science-and-data-analysis!

I can help add tests for coverage if that's an issue.

[brandondube]

Thanks for the offer! At tip/HEAD, the coverage is 81.0%. Release 1.2 which brought all the NewBiquadXXX functions about doubled the sloc for the entire package. There are a few branches in those routines which are not tested out of what is frankly laziness. If you'd like to write some regression tests against the earlevel.com biquad calculator v3, I'd gladly accept the PR.

As to awesome-go, I am neutral about that on the whole. I have no problem including pctl in the index, but I personally do not really want to put the awesome badge on the README.