ci(.travis.yml): update Ansible to 2.3.3.0

Changelogs:
- https://github.com/ansible/ansible/blob/stable-2.3/CHANGELOG.md
- https://docs.ansible.com/ansible/latest/porting_guides/porting_guide_2.3.html

Part of #1142

Author: php-coder

.travis.yml

@@ -26,7 +26,7 @@ before_script:
       mkdir -p /tmp/uploads /tmp/preview;
       cp src/main/resources/test/test.png /tmp/uploads/1.png;
       npm install -g bootlint;
-      pip install --user html5validator robotframework-lint ansible==2.2.3.0 ansible-lint;
+      pip install --user html5validator robotframework-lint ansible==2.3.3.0 ansible-lint;
       if [ "$TRAVIS_PULL_REQUEST" != 'false' ]; then
         gem install danger nokogiri --no-ri --no-rdoc;
       fi;