diff --git a/package-lock.json b/package-lock.json
index dd764fc..ac8d767 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -27,11 +27,59 @@
         "regenerator-runtime": "^0.11.0"
       }
     },
+    "bn.js": {
+      "version": "4.11.9",
+      "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.11.9.tgz",
+      "integrity": "sha512-E6QoYqCKZfgatHTdHzs1RRKP7ip4vvm+EyRUeE2RF0NblwVvb0p6jSVeNTOFxPn26QXN2o6SMfNxKp6kU8zQaw=="
+    },
+    "brorand": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/brorand/-/brorand-1.1.0.tgz",
+      "integrity": "sha1-EsJe/kCkXjwyPrhnWgoM5XsiNx8="
+    },
     "core-js": {
       "version": "2.6.1",
       "resolved": "https://registry.npmjs.org/core-js/-/core-js-2.6.1.tgz",
       "integrity": "sha512-L72mmmEayPJBejKIWe2pYtGis5r0tQ5NaJekdhyXgeMQTpJoBsH0NL4ElY2LfSoV15xeQWKQ+XTTOZdyero5Xg=="
     },
+    "core-util-is": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
+      "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac="
+    },
+    "elliptic": {
+      "version": "6.5.4",
+      "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.5.4.tgz",
+      "integrity": "sha512-iLhC6ULemrljPZb+QutR5TQGB+pdW6KGD5RSegS+8sorOZT+rdQFbsQFJgvN3eRqNALqJer4oQ16YvJHlU8hzQ==",
+      "requires": {
+        "bn.js": "^4.11.9",
+        "brorand": "^1.1.0",
+        "hash.js": "^1.0.0",
+        "hmac-drbg": "^1.0.1",
+        "inherits": "^2.0.4",
+        "minimalistic-assert": "^1.0.1",
+        "minimalistic-crypto-utils": "^1.0.1"
+      }
+    },
+    "hash.js": {
+      "version": "1.1.7",
+      "resolved": "https://registry.npmjs.org/hash.js/-/hash.js-1.1.7.tgz",
+      "integrity": "sha512-taOaskGt4z4SOANNseOviYDvjEJinIkRgmp7LbKP2YTTmVxWBl87s/uzK9r+44BclBSp2X7K1hqeNfz9JbBeXA==",
+      "requires": {
+        "inherits": "^2.0.3",
+        "minimalistic-assert": "^1.0.1"
+      }
+    },
+    "hmac-drbg": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/hmac-drbg/-/hmac-drbg-1.0.1.tgz",
+      "integrity": "sha1-0nRXAQJabHdabFRXk+1QL8DGSaE=",
+      "requires": {
+        "hash.js": "^1.0.3",
+        "minimalistic-assert": "^1.0.0",
+        "minimalistic-crypto-utils": "^1.0.1"
+      }
+    },
     "inherits": {
       "version": "2.0.4",
       "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.4.tgz",
@@ -303,17 +351,6 @@
           "resolved": "https://registry.npmjs.org/domain-browser/-/domain-browser-1.1.7.tgz",
           "integrity": "sha1-hnqksJP6oF8d4IwG9NeyH9+GmLw="
         },
-        "elliptic": {
-          "version": "6.3.2",
-          "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.3.2.tgz",
-          "integrity": "sha1-5MgeCCnPCmWrcOmYuCMnI7XBvEg=",
-          "requires": {
-            "bn.js": "^4.4.0",
-            "brorand": "^1.0.1",
-            "hash.js": "^1.0.0",
-            "inherits": "^2.0.1"
-          }
-        },
         "events": {
           "version": "1.1.1",
           "resolved": "https://registry.npmjs.org/events/-/events-1.1.1.tgz",
@@ -518,6 +555,21 @@
             "safe-buffer": "~5.1.1",
             "string_decoder": "~1.1.0",
             "util-deprecate": "~1.0.1"
+          },
+          "dependencies": {
+            "process-nextick-args": {
+              "version": "2.0.1",
+              "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-2.0.1.tgz",
+              "integrity": "sha512-3ouUOpQhtgrbOa17J7+uxOTpITYWaGP7/AhoR3+A+/1e9skrzelGi/dXzEYyvbxubEF6Wn2ypscTKiKJFFn1ag=="
+            },
+            "string_decoder": {
+              "version": "1.1.1",
+              "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
+              "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
+              "requires": {
+                "safe-buffer": "~5.1.0"
+              }
+            }
           }
         },
         "rimraf": {
@@ -553,6 +605,35 @@
           "requires": {
             "inherits": "~2.0.1",
             "readable-stream": "^2.0.2"
+          },
+          "dependencies": {
+            "process-nextick-args": {
+              "version": "2.0.1",
+              "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-2.0.1.tgz",
+              "integrity": "sha512-3ouUOpQhtgrbOa17J7+uxOTpITYWaGP7/AhoR3+A+/1e9skrzelGi/dXzEYyvbxubEF6Wn2ypscTKiKJFFn1ag=="
+            },
+            "readable-stream": {
+              "version": "2.3.7",
+              "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.7.tgz",
+              "integrity": "sha512-Ebho8K4jIbHAxnuxi7o42OrZgF/ZTNcsZj6nRKyUmkhLFq8CHItp/fy6hQZuZmP/n3yZ9VBUbp4zz/mX8hmYPw==",
+              "requires": {
+                "core-util-is": "~1.0.0",
+                "inherits": "~2.0.3",
+                "isarray": "~1.0.0",
+                "process-nextick-args": "~2.0.0",
+                "safe-buffer": "~5.1.1",
+                "string_decoder": "~1.1.1",
+                "util-deprecate": "~1.0.1"
+              }
+            },
+            "string_decoder": {
+              "version": "1.1.1",
+              "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
+              "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
+              "requires": {
+                "safe-buffer": "~5.1.0"
+              }
+            }
           }
         },
         "string_decoder": {
@@ -598,6 +679,13 @@
           "integrity": "sha1-evsa/lCAUkZInj23/g7TeTNqwPk=",
           "requires": {
             "inherits": "2.0.1"
+          },
+          "dependencies": {
+            "inherits": {
+              "version": "2.0.1",
+              "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.1.tgz",
+              "integrity": "sha1-sX0I0ya0Qj5Wjv9xn5GwscvfafE="
+            }
           }
         },
         "util-deprecate": {
@@ -620,6 +708,16 @@
         }
       }
     },
+    "minimalistic-assert": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/minimalistic-assert/-/minimalistic-assert-1.0.1.tgz",
+      "integrity": "sha512-UtJcAD4yEaGtjPezWuO9wC4nwUnVH/8/Im3yEHQP4b67cXlD/Qr9hdITCU1xDbSEXg2XKNaP8jsReV7vQd00/A=="
+    },
+    "minimalistic-crypto-utils": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/minimalistic-crypto-utils/-/minimalistic-crypto-utils-1.0.1.tgz",
+      "integrity": "sha1-9sAMHAsIIkblxNmd+4x8CDsrWCo="
+    },
     "process-nextick-args": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-2.0.1.tgz",