2.12.0

Features

• Convert interface to fun interface to use SAM converting #216, #217 (@chibatching)
• Add isInitialized property to Kotpref object #218 (@chibatching)
• Remove deprecated class and function #213 (@chibatching)

Experimental Features

• Add builder for custom preference #215 (@chibatching)
• Add dsl for Preference #210 (@janbina)

Maintenance

• Update kotlin to 1.4.10 #219 (@chibatching)
• Update dependencies #212 (@chibatching)
• Fix CircleCI build error #211 (@chibatching)
• Update gradle wrapper #208 (@chibatching)