Updated README.md to suggest saving nginx env file as *-env.conf.
Update README.md

Warning: '-rm' is deprecated, it will be replaced by '--rm' soon. See usage.
Merge pull request #32 from austengary/master

Update README.md
Merge pull request #24 from jperville/fix-readme-nginx-env-conf

Setting env in nginx: /etc/main.d/*.env not included