Fix runelite-plugin-archetype

- Use "install" instead of "verify" so archetype test can pick up the
latest RuneLite version
- Remove "clean" from goals.txt

Fixes #364

Signed-off-by: Tomas Slusny <slusnucky@gmail.com>

travis/build.sh

@@ -8,5 +8,5 @@ PROJECT_VERSION=`mvn -q -Dexec.executable="echo" -Dexec.args='${project.version}
 if [[ "${TRAVIS_PULL_REQUEST}" == "false" && $PROJECT_VERSION == *"-SNAPSHOT" && "$TRAVIS_BRANCH" == "master" ]]; then
 	mvn clean deploy --settings travis/settings.xml
 else
-	mvn clean verify --settings travis/settings.xml
+	mvn clean install --settings travis/settings.xml
 fi