Merge pull request #9 from boneskull/master

fixed update phase string output; made it a bit more readable imo
Fix #10 - async problems with multiple packages outdated
0.5.5
update readme
update deps
0.5.6
update packages, remove async
0.5.7
update badges to flat
Update README.md
update deps
0.5.8
added option to save exact version of updated package

- added option `exact` to save the exact version of a package, not `~<version>` or `^<version>` or whatever NPM want to do.
- updated docs
- bumped patch version