Bump to 2.1.8

Author: Philipp Alferov

package.json

@@ -1,12 +1,12 @@
 {
   "name": "array-to-tree",
-  "version": "2.1.7",
+  "version": "2.1.8",
   "description": "Convert a plain array of nodes (with pointers to parent nodes) to a tree",
   "main": "index.js",
   "scripts": {
     "test": "mocha --reporter nyan",
     "tdd": "npm test -- --watch",
-    "release": "npm version ${BUMP:-\"patch\"} --no-git-tag-version && git add package.json && git commit -m \":octocat: Bump to $(cat package.json | jq -r .version)\" && git tag $(cat package.json | jq -r .version) && git push && git push --tags && npm publish",
+    "release": "npm version ${BUMP:-\"patch\"} --no-git-tag-version && git add package.json && git commit -m \":octocat: Bump to $(cat package.json | jq -r .version)\" && git tag $(cat package.json | jq -r .version) && git push && git push --tags && npm publish"
   },
   "repository": "alferov/array-to-tree",
   "keywords": [