travis: Split long lines in script

Author: scop

.travis.yml

@@ -16,4 +16,6 @@ before_install:
   - docker build -t bash-completion:$DIST -f test/docker/Dockerfile-$DIST .
 
 script:
-  - docker run -e CI=true -e DIST=$DIST -e BSD=$BSD -t bash-completion:$DIST test/docker/docker-script.sh
+  - docker run
+    -e CI=true -e DIST=$DIST -e BSD=$BSD
+    -t bash-completion:$DIST test/docker/docker-script.sh