update LICENSE in package.json

package.json

@@ -31,7 +31,7 @@
     "url": "https://git.gaetanbrochard.dev/gbrochar/expo-web.git"
   },
   "author": "gbrochar",
-  "license": "GPLv3",
+  "license": "AGPL-3.0-only",
   "devDependencies": {
     "@babel/core": "^7.12.3",
     "@babel/plugin-proposal-class-properties": "^7.12.1",