chore(config): update travis.yml and package.json

.travis.yml

@@ -3,12 +3,11 @@ language: node_js
 cache:
   directories:
     - node_modules
+    - ~/.npm
 notifications:
   email: false
 node_js:
   - 'node'
-before_install:
-  - npm i -g npm@^2.0.0
 before_script:
   - npm prune
 script:

package.json

@@ -17,8 +17,7 @@
     "test:coverage": "tap test/{unit,integration}/*.js --coverage --coverage-report=lcov",
     "test:benchmark": "node test/benchmark/performance.js",
     "test": "npm run test:lint && npm run test:unit && npm run test:integration",
-    "semantic-release": "semantic-release",
-    "travis-deploy-once": "travis-deploy-once"
+    "semantic-release": "semantic-release"
   },
   "dependencies": {
     "ajv": "6.3.0",
@@ -38,8 +37,7 @@
     "glob": "^7.0.6",
     "husky": "0.14.3",
     "semantic-release": "^15.1.6",
-    "tap": "^11.1.3",
-    "travis-deploy-once": "^4.4.1"
+    "tap": "^11.1.3"
   },
   "engines": {
     "node": ">=8.0"