build: add release script

build/release.sh

@@ -0,0 +1,38 @@
+git checkout master
+git merge dev
+
+#!/usr/bin/env sh
+set -e
+
+if [[ -z $1 ]]; then
+  echo "Enter new version: "
+  read -r VERSION
+else
+  VERSION=$1
+fi
+
+read -p "Releasing $VERSION - are you sure? (y/n) " -n 1 -r
+echo
+if [[ $REPLY =~ ^[Yy]$ ]]
+then
+  echo "Releasing $VERSION ..."
+
+  # build
+  VERSION=$VERSION npm run build
+
+  npm version $VERSION --message "$VERSION"
+
+  # publish
+  git push origin master
+  git push origin refs/tags/v$VERSION
+  git checkout dev
+  git rebase master
+  git push origin dev
+
+  if [[ $VERSION =~ "beta" ]]
+  then
+    npm publish --tag beta
+  else
+    npm publish
+  fi
+fi