Upgrade maven-compiler-plugin to 3.8.0

Change-Id: Icc1d473b4571f6401a1188d951e42ead7250b274

pom.xml

diff --git a/pom.xml b/pom.xml
index efc892c..411ad49 100644
--- a/pom.xml
+++ b/pom.xml
@@ -380,7 +380,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-compiler-plugin</artifactId>
-        <version>3.7.0</version>
+        <version>3.8.0</version>
         <configuration>
           <compilerId>javac-with-errorprone</compilerId>
           <forceJavacCompilerUse>true</forceJavacCompilerUse>