Updated Maven Compiler Plugin version from 3.7.0 to 3.8.1
<!-- plugins -->
<!-- can't upgrade the plugin yet; as there is an issue with 2.22 no longer running all the tests-->
<maven-surefire-plugin.version>2.21.0</maven-surefire-plugin.version>
- <maven-compiler-plugin.version>3.7.0</maven-compiler-plugin.version>
+ <maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
<exec-maven-plugin.version>1.6.0</exec-maven-plugin.version>
<java.version>1.8</java.version>
<log4j.version>1.2.17</log4j.version>
