ci: update semantic-release

.travis.yml

@@ -1,18 +1,8 @@
 sudo: false
 language: node_js
-cache:
-  directories:
-    - node_modules
 notifications:
   email: false
 node_js:
   - '9'
-before_install:
-  - npm i -g npm@^2.0.0
-before_script:
-  - npm prune
 after_success:
-  - npm run semantic-release
-branches:
-  except:
-    - /^v\d+\.\d+\.\d+$/
+  - npx semantic-release

package.json

@@ -19,7 +19,6 @@
     "browserify": "15.2.0",
     "cz-conventional-changelog": "^2.1.0",
     "gh-pages": "1.1.0",
-    "semantic-release": "^12.2.4",
     "standard": "^11.0.1"
   },
   "directories": {