Add release script

release.sh

+#!/bin/bash
+
+current=`grep -P "version\": \"\d+.\d+.\d+(\w*)" package.json | grep -oP "\d+.\d+.\d+(\w*)"`
+echo "Current version: $current"
+
+if [[ $1 =~ ^[0-9]+.[0-9]+.[0-9]+((a|b)[0-9]+)?$ ]]; then
+  # Change the version in package.json and test file
+  sed -i "s/version\": \"$current/version\": \"$1/g" package.json
+
+  # Commit
+  git reset HEAD
+  git add package.json
+  git commit -m "v$1"
+  git tag "v$1"
+else
+  echo "Wrong version format"
+fi