Bump semantic-release to latest (#67)

Will follow up with a version bump for the contentful-typescript-codegen.

Author: lorcan

.circleci/config.yml

@@ -3,7 +3,7 @@ version: 2
 defaults: &defaults
   working_directory: ~/repo
   docker:
-    - image: circleci/node:10.15.0
+    - image: circleci/node:10.19
 
 jobs:
   test:

package.json

@@ -62,7 +62,7 @@
     "rollup-plugin-node-resolve": "^5.2.0",
     "rollup-plugin-sourcemaps": "^0.4.2",
     "rollup-plugin-typescript2": "^0.22.1",
-    "semantic-release": "^15.13.19",
+    "semantic-release": "^17.4.1",
     "ts-jest": "^24.0.2",
     "ts-node": "^8.3.0",
     "tslint": "^5.18.0",