Run Travis tests against newer versions of Node and MongoDb

Author: Alec Gibson

.travis.yml

@@ -1,29 +1,27 @@
 language: node_js
 
 node_js:
-  - 7
-  - 6
-  - 4
-  - 0.10
+  - "6"
+  - "8"
+  - "10"
 
 services:
   - docker
 
 env:
-  - MONGODB_VERSION="2.4"
   - MONGODB_VERSION="2.6"
-  - MONGODB_VERSION="3.0"
-  - MONGODB_VERSION="3.2"
-  - MONGODB_VERSION="3.4"
+  - MONGODB_VERSION="3.6"
+  - MONGODB_VERSION="4.0"
 
 before_install:
   - docker run -d -p 127.0.0.1:27017:27017 mongo:$MONGODB_VERSION
 
 before_script:
   - until nc -z localhost 27017; do echo Waiting for MongoDB; sleep 1; done
 
-# Run twice due to Mongo flakiness
-script: "npm run test-cover || npm run test-cover"
+script:
+  - npm run test-cover
 
 # Send coverage data to Coveralls
-after_script: "cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js"
+after_script:
+  - cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js