Fix travis file

Author: joelwurtz

.travis.yml

@@ -24,7 +24,7 @@ matrix:
     include:
         - php: 7.1
           env: COMPOSER_FLAGS="--prefer-stable --prefer-lowest" COVERAGE=true TEST_COMMAND="composer test-ci"
-       -  php: 7.2
+        - php: 7.2
           env: COMPOSER_FLAGS="--prefer-stable --prefer-lowest"
         - php: 7.3
           env: USE_ASYNC=true