Update README.md with pointers to LinkedIn's Artifactory and Maven Ce…

…ntral (#9)

* Updated README.md to replace Bintray with Artifactory.
* Added Maven Central documentation.
* Bumped version to 0.3.* to ensure that the latest version of LiFT is valid.

Upgrade Shipkit and Gradle, and move off JCenter (#8)

* Upgraded to Shipkit 3.0 and Gradle 6.x
* Moved to GH Actions from Travis CI
* Added the ability to publish to LinkedIn Artifactory and Maven Central directly

Created new tag v0.2.1 [ci skip]

Created new tag v0.2.0 [ci skip]

Created new tag v0.1.4 [ci skip]

Created new tag v0.1.3 [ci skip]

Created new tag v0.1.2 [ci skip]