travis: Use && intead of ;

Show errors sooner and try not to hide them behind lots of other walls of text.

.travis.yml

@@ -66,10 +66,10 @@ script:
       if [ "$ALLOW_PR" = "" ] && [ "$TRAVIS_BRANCH" != "auto" ]; then
           echo skipping, not a full build;
       elif [ "$TRAVIS_OS_NAME" = "osx" ]; then
-          git submodule update --init;
+          git submodule update --init &&
           src/ci/run.sh;
       else
-          git submodule update --init;
+          git submodule update --init &&
           src/ci/docker/run.sh $IMAGE;
       fi