update elliptic to 6.5.2

Author: fanatid

package.json

@@ -52,7 +52,7 @@
     "bn.js": "^4.11.8",
     "create-hash": "^1.2.0",
     "drbg.js": "^1.0.1",
-    "elliptic": "^6.4.1",
+    "elliptic": "^6.5.2",
     "nan": "^2.14.0",
     "safe-buffer": "^5.1.2"
   },