Update README.md
Update README.md
Merge branch 'master' of https://github.com/Yitsushi/prohardver-push-notifier into Yitsushi-master

Conflicts:
	README.md
Fixed sanity check of the PushBullet API key (can be longer than 32 characters).
Fixed note formatting.
Implemented a new message format: direct links to new topics. It will get much more practical when the message filtering is complete.
Update README.md

Added missing cd command to the example.