Try to make travis happy (again)

.travis.yml

@@ -9,5 +9,5 @@ node_js:
 before_install:
  - npm install --only=dev
 script:
- - npm run prepare
+ - npm run build
  - npm test

package.json

@@ -39,7 +39,7 @@
     "typescript": "^2.6.2"
   },
   "scripts": {
-    "prepare": "tsc",
+    "build": "tsc",
     "test": "tslint -c ./tslint.json --project ./tsconfig.json ./src/**/*.ts",
     "start": "node ./bin/crunchy"
   },