fix(ci): properly setup semantic-release for travis

Author: Introvertuous

.travis.yml

@@ -5,12 +5,12 @@ cache:
 notifications:
   email: false
 node_js:
+  - '9'
   - '8'
 script:
   - npm run build
-  - npm run test
 after_success:
-  - npm run semantic-release
+  - npm run travis-deploy-once "npm run semantic-release"
 branches:
   except:
     - /^v\d+\.\d+\.\d+$/

package.json

@@ -13,12 +13,12 @@
   "scripts": {
     "dev": "tsc --watch",
     "build": "tsc",
-    "semantic-release": "semantic-release pre && yarn build && yarn publish && semantic-release post"
+    "travis-deploy-once": "travis-deploy-once"
   },
   "devDependencies": {
     "@types/node": "^7.0.21",
     "prettier": "^1.7.4",
-    "semantic-release": "^8.2.0",
-    "typescript": "^2.3.2"
+    "typescript": "^2.3.2",
+    "travis-deploy-once": "^5.0.1"
   }
 }