pymzml only for python3 (#13543)
pymzml only for python3 (#13543)

* [ ] I have read the [guidelines for bioconda recipes](https://bioconda.github.io/guidelines.html).
* [ ] This PR adds a new recipe.
* [ ] AFAIK, this recipe **is directly relevant to the biological sciences** (otherwise, please submit to the more general purpose [conda-forge channel](https://conda-forge.org/docs/)).
* [ ] This PR updates an existing recipe.
* [ ] This PR does something else (explain below).

bebatut/bioconda-recipes,shenwei356/bioconda-recipes,blankenberg/bioconda-recipes,bioconda/bioconda-recipes,ivirshup/bioconda-recipes,bioconda/recipes,gregvonkuster/bioconda-recipes,bioconda/bioconda-recipes,ivirshup/bioconda-recipes,chapmanb/bioconda-recipes,joachimwolff/bioconda-recipes,joachimwolff/bioconda-recipes,ivirshup/bioconda-recipes,mdehollander/bioconda-recipes,peterjc/bioconda-recipes,phac-nml/bioconda-recipes,bioconda/bioconda-recipes,rob-p/bioconda-recipes,blankenberg/bioconda-recipes,phac-nml/bioconda-recipes,Luobiny/bioconda-recipes,rvalieris/bioconda-recipes,rob-p/bioconda-recipes,npavlovikj/bioconda-recipes,cokelaer/bioconda-recipes,mdehollander/bioconda-recipes,zachcp/bioconda-recipes,zachcp/bioconda-recipes,acaprez/recipes,acaprez/recipes,rob-p/bioconda-recipes,bebatut/bioconda-recipes,jfallmann/bioconda-recipes,chapmanb/bioconda-recipes,shenwei356/bioconda-recipes,mdehollander/bioconda-recipes,saketkc/bioconda-recipes,chapmanb/bioconda-recipes,ostrokach/bioconda-recipes,phac-nml/bioconda-recipes,ostrokach/bioconda-recipes,gregvonkuster/bioconda-recipes,ostrokach/bioconda-recipes,rvalieris/bioconda-recipes,phac-nml/bioconda-recipes,blankenberg/bioconda-recipes,mdehollander/bioconda-recipes,rvalieris/bioconda-recipes,gregvonkuster/bioconda-recipes,npavlovikj/bioconda-recipes,peterjc/bioconda-recipes,roryk/recipes,joachimwolff/bioconda-recipes,bebatut/bioconda-recipes,ostrokach/bioconda-recipes,Luobiny/bioconda-recipes,peterjc/bioconda-recipes,acaprez/recipes,bioconda/recipes,rob-p/bioconda-recipes,ivirshup/bioconda-recipes,joachimwolff/bioconda-recipes,acaprez/recipes,jfallmann/bioconda-recipes,saketkc/bioconda-recipes,saketkc/bioconda-recipes,cokelaer/bioconda-recipes,saketkc/bioconda-recipes,mdehollander/bioconda-recipes,zachcp/bioconda-recipes,saketkc/bioconda-recipes,jfallmann/bioconda-recipes,jfallmann/bioconda-recipes,chapmanb/bioconda-recipes,bebatut/bioconda-recipes,peterjc/bioconda-recipes,roryk/recipes,shenwei356/bioconda-recipes,ivirshup/bioconda-recipes,rvalieris/bioconda-recipes,npavlovikj/bioconda-recipes,ostrokach/bioconda-recipes,mdehollander/bioconda-recipes,rvalieris/bioconda-recipes,ivirshup/bioconda-recipes,blankenberg/bioconda-recipes,joachimwolff/bioconda-recipes,phac-nml/bioconda-recipes,Luobiny/bioconda-recipes,saketkc/bioconda-recipes,bioconda/recipes,cokelaer/bioconda-recipes,peterjc/bioconda-recipes,bioconda/bioconda-recipes,cokelaer/bioconda-recipes,gregvonkuster/bioconda-recipes,shenwei356/bioconda-recipes,joachimwolff/bioconda-recipes,roryk/recipes,chapmanb/bioconda-recipes,ostrokach/bioconda-recipes,zachcp/bioconda-recipes,npavlovikj/bioconda-recipes,peterjc/bioconda-recipes,Luobiny/bioconda-recipes,rvalieris/bioconda-recipes