Added 'dist: precise' config (see details at https://blog.travis-ci.com/2017-07-11-trusty-as-default-linux-is-coming)
Added 'dist: precise' config (see details at https://blog.travis-ci.com/2017-07-11-trusty-as-default-linux-is-coming)

ClinGen/clincoded,ClinGen/clincoded,ClinGen/clincoded,ClinGen/clincoded,ClinGen/clincoded