Adding missing superagent dependencies

Author: Perki

components/pryv/package.json

@@ -1,6 +1,6 @@
 {
   "name": "pryv",
-  "version": "2.3.8",
+  "version": "2.3.9",
   "description": "Pryv JavaScript library",
   "keywords": [
     "Pryv",
@@ -14,6 +14,9 @@
     "type": "git",
     "url": "git://github.com/pryv/lib-js"
   },
+  "dependencies": {
+    "superagent": "^8.0.6"
+  },
   "license": "BSD-3-Clause",
   "author": "Pryv S.A. <info@pryv.com> (https://pryv.com)",
   "main": "src/index.js",