Add authors and version fields

Author: ivankravets

library.json

@@ -2,11 +2,17 @@
   "name": "NTPClient",
   "keywords": "ntp, client, time",
   "description": "A NTPClient to connect to a time server",
+  "authors": 
+  {
+    "name": "Fabrice Weinberg",
+    "email": "fabrice@weinberg.me"
+  },
   "repository":
   {
     "type": "git",
     "url": "https://github.com/FWeinb/NTPClient.git"
   },
+  "version": "3.0.0",
   "frameworks": "arduino",
   "platforms": "espressif"
-}
+}