bump elliptic (#58)

* bump elliptic

* update package-lock

Author: calvinmetcalf

package-lock.json

@@ -27,7 +27,7 @@
     "browserify-rsa": "^4.0.1",
     "create-hash": "^1.2.0",
     "create-hmac": "^1.1.7",
-    "elliptic": "^6.5.2",
+    "elliptic": "^6.5.3",
     "inherits": "^2.0.4",
     "parse-asn1": "^5.1.5",
     "readable-stream": "^3.6.0",