Describe the problem you'd like to have solved

This SDK currently sets a target source and target compatibility of Java 7. In actuality, third-party updates have required Java 8 to use this SDK since version 1.18.

Additionally, Java 8 (released in 2014) brings features such as improved Date/Time APIs, native Base64 encoding/decoding, async processing, amongst other features, that we should be able to incorporate into the SDK.

Describe the ideal solution

Given the age of lack of support for Java 7, the target and source and compatibility should be set to Java 8.

This should be done in a new minor version, given the age of Java 7 and the current incompatibility of this SDK with Java < 8.