Bump maven-compiler-plugin from 3.8.1 to 3.9.0

Bumps [maven-compiler-plugin](https://github.com/apache/maven-compiler-plugin) from 3.8.1 to 3.9.0.
- [Release notes](https://github.com/apache/maven-compiler-plugin/releases)
- [Commits](https://github.com/apache/maven-compiler-plugin/compare/maven-compiler-plugin-3.8.1...maven-compiler-plugin-3.9.0)

---
updated-dependencies:
- dependency-name: org.apache.maven.plugins:maven-compiler-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Resolves #48

Change-Id: I8bc9ced72ec6f4b2b15d5e22af0b5385c63e8ab3
diff --git a/pom.xml b/pom.xml
index 284190a..2675c7f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -103,7 +103,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.8.1</version>
+                <version>3.9.0</version>
                 <configuration>
                     <source>1.8</source>
                     <target>1.8</target>