Pin to conda < 4.6.0 to avoid slow resolve times
Pin to conda < 4.6.0 to avoid slow resolve times

conda 4.6.0 takes exceptionally long to resolve with conda-forge,
pin to a previous version to avoid for now:
https://groups.google.com/d/msg/biovalidation/ZfcH1K7I-_I/mT6L-0M5DgAJ

chapmanb/cloudbiolinux,chapmanb/cloudbiolinux,chapmanb/cloudbiolinux,chapmanb/cloudbiolinux