Update licence

Ref di/vue-formbuilder#40

package-lock.json

 {
   "name": "@vue-unistra/formbuilder",
-  "version": "4.0.2",
+  "version": "4.1.1",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "@vue-unistra/formbuilder",
-      "version": "4.0.2",
+      "version": "4.1.1",
       "dependencies": {
         "@quasar/extras": "^1.15.5",
         "axios": "^1.2.1",

package.json

@@ -3,6 +3,7 @@
   "version": "4.1.1",
   "type": "module",
   "types": "./types/index.d.ts",
+  "license": "LGPL-3.0",
   "publishConfig": {
     "@vue-unistra:registry": "https://git.unistra.fr/api/v4/projects/17878/packages/npm/"
   },