Release Mapbox Navigation 0.3.0

[cammace]

This ticket tracks the release of Mapbox Android Navigation SDK v0.3.0. The leading feature in this release are listed below:

Highlights

• Support for other direction profiles (cycling and walking) added.
• Fixed issue with step and leg indexes not getting restarted when reroute occurred.
• Resolved issue with second navigation session not kicking off service again (preventing listeners getting invoked).
• Added missing MapboxNavigationOptions getter inside the MapboxNavigation class.

Release checklist @cammace @zugaldia

• Finish merging PRs that exist on the 0.3.0 milestone
• Run through testapp/demo app and test all activities
• Change version name to 0.3.0 in gradle.properties
• Publish 0.3.0 artifact to Maven Central
• Change version name back to 0.4.0-SNAPSHOT
• Update CHANGELOG.md
• Tag v0.3.0 in GitHub

Post-release @langsmith

• Update README.md
• Update Javadoc and docs in https://www.mapbox.com/android-docs/mapbox-services/latest/getting-started/
• Update /android-docs

/cc: @mapbox/navigation

[cammace]

The release is now live and all steps have been finished (PRs opened). Going ahead and closing.