chore: update node, semantic-release

Author: LexSwed

.travis.yml

@@ -2,9 +2,8 @@ version: ~> 1.0
 import: Typeform/travis-shared-config:package-config.yml@master
 
 language: node_js
-
 node_js:
-  - "8"
+  - "12"
 
 branches:
   only:

package.json

@@ -71,7 +71,7 @@
     "rollup-plugin-node-resolve": "^5.2.0",
     "rollup-plugin-terser": "^5.1.1",
     "rollup-plugin-typescript2": "^0.24.1",
-    "semantic-release": "^15.13.24",
+    "semantic-release": "^17.0.7",
     "ts-jest": "^24.0.2",
     "tslint": "^5.20.0",
     "tslint-config-standard": "^8.0.1",