Fix(module): Update package.json & travis.yml according sem-release docs

Author: Philipp Alferov

.travis.yml

@@ -14,6 +14,8 @@ before_install:
 before_script:
   - npm prune
   - 'curl -Lo travis_after_all.py https://git.io/vLSON'
+script:
+  - npm run test
 after_success:
   - python travis_after_all.py
   - export $(cat .to_export_back)

package.json

@@ -1,5 +1,6 @@
 {
   "name": "array-to-tree",
+  "version": "0.0.0-semantically-released",
   "description": "Convert a plain array of nodes (with pointers to parent nodes) to a tree",
   "main": "index.js",
   "scripts": {