Release version 2.2.0

What's Changed

• snapshot v2.2.0 by @mdnazmulkarim in #796
• QuickFix: { "translatorOptions" : "" } throws IllegalArgumentException by @vitorpamplona in #802
• Synchronize access to ServiceLoaders to prevent race conditions by @JPercival in #806
• Swap xpp3 implementation to support Java 9+ by @JPercival in #797
• Make service loaders error if multiple implementations are found on classpath by @JPercival in #807
• Support compiling CQL on multiple threads by @JPercival in #808
• Use 'java-library' plugin, clean up dependencies by @JPercival in #809
• Formalizes compliance with Android 8, SDK 26 (2017+) by @vitorpamplona in #810
• Fix qicore modelinfo 20 by @brynrhodes in #812

Full Changelog: v2.1.0...v2.2.0