ci: automate changelog generation (#1792)

package.json

@@ -5,7 +5,7 @@
   "main": "dist/npm/index.js",
   "module": "dist/html2canvas.js",
   "browser": "dist/html2canvas.js",
-  "version": "1.0.0-alpha.12",
+  "version": "1.0.0-alpha.13",
   "author": {
     "name": "Niklas von Hertzen",
     "email": "niklasvh@gmail.com",
@@ -33,9 +33,9 @@
     "babel-preset-es2015": "6.24.1",
     "babel-preset-flow": "6.23.0",
     "base64-arraybuffer": "0.1.5",
-    "body-parser": "1.17.2",
+    "body-parser": "^1.18.3",
     "chai": "4.1.1",
-    "chromeless": "1.2.0",
+    "chromeless": "^1.5.2",
     "cors": "2.8.4",
     "eslint": "4.2.0",
     "eslint-plugin-flowtype": "2.35.0",
@@ -67,8 +67,9 @@
     "rollup-plugin-commonjs": "^9.1.0",
     "rollup-plugin-node-resolve": "^3.3.0",
     "rollup-plugin-uglify": "^3.0.0",
-    "serve-index": "1.9.0",
+    "serve-index": "^1.9.1",
     "slash": "1.0.0",
+    "standard-version": "^5.0.2",
     "uglifyjs-webpack-plugin": "^1.1.2",
     "webpack": "3.4.1"
   },
@@ -76,6 +77,7 @@
     "build": "rimraf dist/ && node scripts/create-reftest-list && npm run build:npm && npm run build:browser",
     "build:npm": "babel src/ -d dist/npm/ --plugins=dev-expression,transform-es2015-modules-commonjs && replace-in-file __VERSION__ '\"$npm_package_version\"' dist/npm/index.js",
     "build:browser": "webpack",
+    "release": "standard-version",
     "rollup": "rollup -c",
     "format": "prettier --single-quote --no-bracket-spacing --tab-width 4 --print-width 100 --write \"{src,www/src,tests,scripts}/**/*.js\"",
     "flow": "flow",