chore: bump version

package.json

 {
   "name": "sinologie-anki-pack",
-  "version": "3.0.0",
+  "version": "3.1.0",
   "description": "Anki template for learning to write, speak and understand Mandarin Chinese",
   "repository": "https://gitlab.phaidra.org/kartenaale/sinologie-anki-pack",
   "author": "Philipp Stadler <hello@phstadler.com>",