patch 0.9.2

• brower error fix. "val is not defined"

patch 0.9.1

More strings can be used as key characters.
In the past, only numbers (0-9), alphabets (a-zA-Z), underscores (_),
and commas (,) were available.

first release~!

• move from https://github.com/hyunjun19/format
• add unit test(use mocha)