pyenv-pip-migrate: 20181205 (#71525)
pyenv-pip-migrate: 20181205 (#71525)

* pyenv-pip-migrate: 20181205

Update to latest commit and following CalVer used in the current (and only)
release. The project has not made official realeses in quite some time and the
current release contains bugs.

* pyenv-pip-migrate: update artifact and sha

Co-authored-by: rui <907c7afd57be493757f13ccd1dd45dddf02db069@meetup.com>
lemzwerg/homebrew-core,makigumo/homebrew-core,filcab/homebrew-core,makigumo/homebrew-core,spaam/homebrew-core,Linuxbrew/homebrew-core,chrisfinazzo/homebrew-core,chrisfinazzo/homebrew-core,stgraber/homebrew-core,Linuxbrew/homebrew-core,nbari/homebrew-core,mfikes/homebrew-core,uyjulian/homebrew-core,stgraber/homebrew-core,filcab/homebrew-core,Homebrew/homebrew-core,mbcoguno/homebrew-core,cblecker/homebrew-core,mbcoguno/homebrew-core,sjackman/homebrew-core,cblecker/homebrew-core,Moisan/homebrew-core,nandub/homebrew-core,spaam/homebrew-core,Moisan/homebrew-core,nbari/homebrew-core,nandub/homebrew-core,mbcoguno/homebrew-core,Homebrew/homebrew-core,zyedidia/homebrew-core,adam-moss/homebrew-core,zyedidia/homebrew-core,uyjulian/homebrew-core,lemzwerg/homebrew-core,sjackman/homebrew-core,adam-moss/homebrew-core,mfikes/homebrew-core,JCount/homebrew-core,JCount/homebrew-core