Update README formatting

Use const in README

Add license

Fix deps for babel (@janriemer, #34)

0.3.6

Use string for default characters

Fixed typo intializing -> initializing (@radarhere, #25)

Fixed typo

0.3.5

Add exclude option documentation to README

Add exclude to baffle options (@danreeves, #17)

Remove extra space from README

Bump to 0.3.4 to sync NPM

0.3.3

0.3.2