Release v0.4.2

[LukasPaczos]

Today we are releasing version 0.4.2 of the Mapbox Gestures for Android library.

Please feel free to provide any feedback you might have and submit issues to the board.

Changes since v0.4.1:

• Query display metrics only in touch down #67

Release checklist

• [x] Create release branch
• [x] Update CHANGELOG.md
• [x] Update README.md
• [x] Change CircleCI config to build from release-vx.x.x branch (release->deploy)
• [x] Change version name to x.x.x in /library/gradle.properties
• [x] Publish x.x.x artifact to Maven Central
• [x] Change version name to z.z.z-SNAPSHOT in /library/gradle.properties
• [x] Change CircleCI config to build back from master branch
• [x] Merge release-vx.x.x back into master
• [x] Tag vx.x.x
• [x] Update library dependency in the Maps SDK

Post-release checklist @langsmith

• [x] If stable version, update version # in android-docs repo's constants.js file
• [x] Add Javadocs to api folder in android-docs repo

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/cc @mapbox/android

[langsmith]

Done !