Version 0.3.0

Introduces a user-settable "true timestamp", as well as several bug fixes

• Blog post

New features

• Added support for true timestamp (#28)
• Added HTTPS support to all emitters (#33)
• Added missing setters for lang, page and useragent (#34)
• Added trackSelfDescribingEvent method (#30)

Bug fixes

• Fixed incorrect instance_identity_document jsonschema (#29)

Build

• Added Bintray credentials to .travis.yml (#41)
• Updated build configuration to publish to JCenter and Maven Central (#31)
• Removed Snowplow Maven Repo and scala-util dependency (#42)