Update security-checker and uncomment this check on Travis CI

Author: bocharsky-bw

.travis.yml

@@ -33,4 +33,4 @@ script:
   # this checks that the Twig template files contain no syntax errors
   - ./bin/console lint:twig app/Resources @CodeExplorerBundle
   # this checks that the application doesn't use dependencies with known security vulnerabilities
-  #- ./bin/console security:check
+  - ./bin/console security:check --end-point=http://security.sensiolabs.org/check_lock