Fix npm test script to fail on error

Author: strausr

.travis.yml

@@ -10,4 +10,4 @@ matrix:
   - node_js: "10"
     script: npm run test-es6
   - node_js: "12"
-      script: npm run test
+    script: npm run test

package.json

@@ -48,7 +48,7 @@
   ],
   "types": "types",
   "scripts": {
-    "test": "node_v=$(node --version)z\nif [[ \"${node_v%%.*z}\" == 'v4' ]]\nthen\nnpm run test-es5\nelse\necho 10 && npm run test-es6\nfi\nnpm run dtslint",
+    "test": "set -e node_v=$(node --version)z\nif [[ \"${node_v%%.*z}\" == 'v4' ]]\nthen\nnpm run test-es5\nelse\nnpm run test-es6\nfi\nnpm run dtslint",
     "dtslint": "dtslint --expectOnly --localTs node_modules/typescript/lib types ",
     "lint": "eslint .",
     "compile": "node_modules/.bin/babel lib --out-dir lib-es5 --delete-dir-on-start --verbose",
@@ -61,3 +61,4 @@
     "node": ">=0.6"
   }
 }
+