try to fix travis build

.travis.yml

@@ -1,7 +1,7 @@
 sudo: false
-cache:
-  directories:
-    - $HOME/.m2
+#cache:
+#  directories:
+#    - $HOME/.m2
 language: java
 jdk:
   - oraclejdk8
@@ -12,7 +12,7 @@ before_install:
   - echo "https://$GH_TOKEN:@github.com" > .git/credentials
   - gem install asciidoctor
 install:
-- ./mvnw install -P docs -U -DskipTests=true
+- ./mvnw install -P docs -q -U -DskipTests=true -Dmaven.test.redirectTestOutputToFile=true
 - ./docs/src/main/asciidoc/ghpages.sh
 script:
 - '[ "${TRAVIS_PULL_REQUEST}" != "false" ] || ./mvnw -s .settings.xml deploy -P release -nsu -Dmaven.test.redirectTestOutputToFile=true'