fix(release): Select files to be included in released package (#4)

Add `dist` folder to the list of files to include when creating
a package

Author: frodeaa

package.json

@@ -7,6 +7,7 @@
   "author": "Thoralf Thelle <[email protected]>",
   "license": "MIT",
   "private": false,
+  "files": ["/dist"],
   "jest": {
     "preset": "ts-jest",
     "testEnvironment": "node",