Update 'packr' dependency.

Gopkg.lock

Gopkg.toml

migrate/migrate.go

vendor/github.com/gobuffalo/envy/.env

vendor/github.com/gobuffalo/envy/.gitignore

vendor/github.com/gobuffalo/envy/.gometalinter.json

vendor/github.com/gobuffalo/envy/.travis.yml

vendor/github.com/gobuffalo/envy/LICENSE.txt

vendor/github.com/gobuffalo/envy/Makefile

vendor/github.com/gobuffalo/envy/README.md

vendor/github.com/gobuffalo/envy/envy.go

vendor/github.com/gobuffalo/envy/envy_test.go

vendor/github.com/gobuffalo/envy/go.mod

vendor/github.com/gobuffalo/envy/go.sum

vendor/github.com/gobuffalo/envy/packrd/packed-packr.go

vendor/github.com/gobuffalo/envy/shoulders.md

vendor/github.com/gobuffalo/envy/test_env/.env

vendor/github.com/gobuffalo/envy/test_env/.env.prod

vendor/github.com/gobuffalo/envy/version.go

vendor/github.com/gobuffalo/packd/.gitignore