Update jacoco version to fix openjdk-11 build issue

fsteeg · fsteeg · commit 2540dfc46495 · 2019-05-20T11:01:15.000+02:00
See https://travis-ci.org/jsonld-java/jsonld-java/jobs/522318660
diff --git a/pom.xml b/pom.xml
@@ -447,7 +447,7 @@
 				<plugin>
 					<groupId>org.jacoco</groupId>
 					<artifactId>jacoco-maven-plugin</artifactId>
-					<version>0.8.1</version>
+					<version>0.8.4</version>
 					<executions>
 						<execution>
 							<id>prepare-agent</id>
