Upgrade jacoco-maven-plugin to 0.8.4

Change-Id: Ibab24e1f5eefdc14bcf9ab6d72eab7e0a0cfaad9
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

pom.xml

@@ -366,7 +366,7 @@
         <plugin>
           <groupId>org.jacoco</groupId>
           <artifactId>jacoco-maven-plugin</artifactId>
-          <version>0.8.3</version>
+          <version>0.8.4</version>
         </plugin>
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>