v0.8.7

Maintenance release. Misc unit test fixes and dependency updates.

• #77 - Unit test timing expectation fix
• #89 - Fix to use DecimalFormatSymbols in adapter tests
• Updated Google Guava to 24.1-jre
• Updated Java Mail to 1.6.1
• Updated spring-boot-maven-plugin to 1.5.10.RELEASE
• Updated to Gradle wrapper to 4.6
• Updated com.gradle.build-scan to 1.12.1
• Updated to Maven wrapper to 3.5.3