build(deps): update dependency org.apache.maven.plugins:maven-compiler-plugin to v3.8.1 (#150)

Author: renovate-bot

pom.xml

@@ -201,7 +201,7 @@
             <plugins>
                 <plugin>
                     <artifactId>maven-compiler-plugin</artifactId>
-                    <version>3.5.1</version>
+                    <version>3.8.1</version>
                     <configuration>
                         <source>1.7</source>
                         <target>1.7</target>