Bump to pyenv v1.0.0
Bump to pyenv v1.0.0

and bump the default pypy to 5.3.1

spurti-chopra/travis-cookbooks,travis-ci/travis-cookbooks,ljharb/travis-cookbooks,travis-ci/travis-cookbooks,ljharb/travis-cookbooks,travis-ci/travis-cookbooks,ljharb/travis-cookbooks,spurti-chopra/travis-cookbooks,spurti-chopra/travis-cookbooks