Update README.md

Added a hackerspace visit entry.

Because places like Noisebridge are great for meeting people,
especially tech people, and getting some cool projects done on the side.
Update README.md
Update README.md
Merge branch 'master' of https://github.com/xzyfer/us-travel-checklist into patch-1

Fixed conflict with other additions.
Conflicts:
	README.md
Merge pull request #11 from sophacles/patch-1

Added hacker space