Polish README
Update example to match README
Add maybe
Add maybe
Bump version to v0.3.0
Add important notice to README
Rename maybe to Maybe
Add mimic
Bump version to v0.4.0
Add Either#to_json (and #to_s)
Add more documentation and specs
Bump version to v0.5.0
Fix converting Either#to_json arrays
Bump version to v0.5.1
Whitespace
Add inspect
Bump version to v0.5.2
Extract None
Bump version to v0.6.0
Add Failure and Success chaining