Ubuntu `read` fails when no variable given

This prevents the error:

    Current version is 0.0.0-dev. This will publish version 0.0.1. Press [enter] to continue./bin/sh: 1: read: arg count
    make: *** [release] Error 2
Linux /bin/sh doesn't like single quotes around multi line commands
Merge pull request #6 from jesstelford/publish-fix

Fix errors in Linux terminals when publishing via `make release-*`