Version 0.3.0 updates most build and library dependencies as outlined in #36. Updating to this version should allow full-Java applications to use this library successfully without downgrading to 0.1.6.

The changes are:

• Updated gradle wrapper: 5.4-rc-1 -> 6.5
• Updated gradle plugin: 3.5.0-beta01 -> 4.1.2
• Kotlin: 1.3.31 -> 1.4.20
• Android compile|targetSdkVersion: 28 -> 30
• App compat: 1.0.2 -> 1.2.0
• Fixed build warning about using deprecated classifier property for sourcesJar task.
• Switched from kotlin-stdlib-jdk7 to kotlin-stdlib