Configure project for Sonatype deployment

[twyatt]

• Deploy snapshots via git branches suffixed with -SNAPSHOT
  • Once deployed, you can view them at https://oss.sonatype.org/content/repositories/snapshots/com/juul/stropping/
• Push to Sonatype via git tags
  • We can promote to Maven central via https://oss.sonatype.org/#welcome

Library consumers can use the snapshots via:

repositories {
    maven { url 'https://oss.sonatype.org/content/repositories/snapshots' }
}

dependencies {
    androidTestImplementation "com.juul.stropping:stropping:$version"
}