Merge pull request #171 from ipfs-shipyard/fix/mvn-java-version

tell maven to use java 11

Author: ianopolous

pom.xml

@@ -69,10 +69,11 @@
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-compiler-plugin</artifactId>
-				<version>3.1</version>
+				<version>3.8.0</version>
 				<configuration>
-					<source>1.8</source>
-					<target>1.8</target>
+					<release>11</release>
+					<source>11</source>
+					<target>11</target>
 				</configuration>
 			</plugin>
 			<plugin>