Merge branch 'release' into 'master'

Release

See merge request !115

packages/Epub/package.json

 {
   "name": "pubsweet-component-epub",
-  "version": "0.2.1",
+  "version": "0.2.2",
   "description": "Backend EPUB export component for PubSweet",
   "main": "index.js",
   "scripts": {