Fix README on publishing to local Maven

Since the switch to the "maven-publish" plugin
(instead of the deprecated "maven" plugin)
in 48e816d,
the correct way to publish to a local Maven
repository is to use the "publishToMavenLocal" task.

Signed-off-by: Johan Kaving <johan@kaving.se>

Author: jkaving

README.md

@@ -24,9 +24,9 @@ If you encounter out of memory errors during the build, increase available heap
 
 	GRADLE_OPTS='-XX:MaxPermSize=1024m -Xmx1024m'
 
-To build and install jars into your local Maven cache:
+To build and publish jars to your local Maven repository:
 
-	./gradlew install
+	./gradlew publishToMavenLocal
 
 To build api Javadoc (results will be in `build/api`):