Attempt to allow failure on node STABLE

Author: flovilmart

.travis.yml

@@ -27,11 +27,14 @@ env:
   - COVERAGE_OPTION='./node_modules/.bin/nyc'
   - NODE_VERSION=8.11.2
   matrix:
-  - MONGODB_VERSION=3.2.13
-  - MONGODB_VERSION=3.4.4
-  - PARSE_SERVER_TEST_DB=postgres
-  - PARSE_SERVER_TEST_CACHE=redis
-  - NODE_VERSION=stable
+    include:
+      - env: MONGODB_VERSION=3.2.13
+      - env: MONGODB_VERSION=3.4.4
+      - env: PARSE_SERVER_TEST_DB=postgres
+      - env: PARSE_SERVER_TEST_CACHE=redis
+      - env: NODE_VERSION=stable
+    allow_failures:
+      - env: NODE_VERSION=stable
 before_install:
 - nvm install $NODE_VERSION
 - nvm use $NODE_VERSION