toolkit 0.3.0

Just a simple toolkit for flutter. Will add extensions to String, Map, and some common helper.

[0.3.0] - 2022-12-18

• Change to extention.
• Change to static.
• Add new regex utility.

[0.2.0] - 2020-07-28

• Add Kit Media Query.

[0.1.0] - 2020-07-05

• Update description, format lib files.

[0.0.1] - 2020-07-05

• New toolkit for map, random, sleep, and string.