Added conda-forge, bioconda; Updated Python version to 3.7

[dsouzadaniel]

This code fixes Issue : #642

• Is it mergeable?
• make test Did it pass the tests?
• make coverage Is the new code covered?
• Did it change the command-line interface? Only additions are allowed
  without a major version increment. Changing file formats also requires a
  major version number increment.
• Was a spellchecker run on the source code and documentation after
  changes were made?

[codecov]

Codecov Report

Merging #677 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #677   +/-   ##
=======================================
  Coverage   89.26%   89.26%           
=======================================
  Files          27       27           
  Lines        4238     4238           
  Branches       39       39           
=======================================
  Hits         3783     3783           
  Misses        455      455

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[luizirber]

Thanks @dsouzadaniel ! Can you please set up an ORCID ID and post here? This way we can credit you =]

[luizirber]

Hi again @dsouzadaniel!

We're gearing up for the sourmash 3.0 paper on JOSS, so...

Can you please set up an ORCID ID and post here? This way we can credit you =]

do you have an ORCID ID? =]

(I'm adding all contributors to codemeta.json in #837)