diff --git a/package-lock.json b/package-lock.json
index c6be705..e5ce52d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2199,6 +2199,36 @@
             "sha.js": "^2.4.8"
          }
       },
+      "cross-env": {
+         "version": "5.2.1",
+         "resolved": "https://registry.npmjs.org/cross-env/-/cross-env-5.2.1.tgz",
+         "integrity": "sha512-1yHhtcfAd1r4nwQgknowuUNfIT9E8dOMMspC36g45dN+iD1blloi7xp8X/xAIDnjHWyt1uQ8PHk2fkNaym7soQ==",
+         "dev": true,
+         "requires": {
+            "cross-spawn": "^6.0.5"
+         },
+         "dependencies": {
+            "cross-spawn": {
+               "version": "6.0.5",
+               "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-6.0.5.tgz",
+               "integrity": "sha512-eTVLrBSt7fjbDygz805pMnstIs2VTBNkRm0qxZd+M7A5XDdxVRWO5MxGBXZhjY4cqLYLdtrGqRf8mBPmzwSpWQ==",
+               "dev": true,
+               "requires": {
+                  "nice-try": "^1.0.4",
+                  "path-key": "^2.0.1",
+                  "semver": "^5.5.0",
+                  "shebang-command": "^1.2.0",
+                  "which": "^1.2.9"
+               }
+            },
+            "semver": {
+               "version": "5.7.1",
+               "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.1.tgz",
+               "integrity": "sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==",
+               "dev": true
+            }
+         }
+      },
       "cross-spawn": {
          "version": "3.0.1",
          "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-3.0.1.tgz",
@@ -2831,18 +2861,38 @@
          }
       },
       "elliptic": {
-         "version": "6.4.0",
-         "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.4.0.tgz",
-         "integrity": "sha1-ysmvh2LIWDYYcAPI3+GT5eLq5d8=",
+         "version": "6.5.4",
+         "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.5.4.tgz",
+         "integrity": "sha512-iLhC6ULemrljPZb+QutR5TQGB+pdW6KGD5RSegS+8sorOZT+rdQFbsQFJgvN3eRqNALqJer4oQ16YvJHlU8hzQ==",
          "dev": true,
          "requires": {
-            "bn.js": "^4.4.0",
-            "brorand": "^1.0.1",
+            "bn.js": "^4.11.9",
+            "brorand": "^1.1.0",
             "hash.js": "^1.0.0",
-            "hmac-drbg": "^1.0.0",
-            "inherits": "^2.0.1",
-            "minimalistic-assert": "^1.0.0",
-            "minimalistic-crypto-utils": "^1.0.0"
+            "hmac-drbg": "^1.0.1",
+            "inherits": "^2.0.4",
+            "minimalistic-assert": "^1.0.1",
+            "minimalistic-crypto-utils": "^1.0.1"
+         },
+         "dependencies": {
+            "bn.js": {
+               "version": "4.12.0",
+               "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.12.0.tgz",
+               "integrity": "sha512-c98Bf3tPniI+scsdk237ku1Dc3ujXQTSgyiPUDEOe7tRkhrqridvh8klBv0HCEso1OLOYcHuCv/cS6DNxKH+ZA==",
+               "dev": true
+            },
+            "inherits": {
+               "version": "2.0.4",
+               "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.4.tgz",
+               "integrity": "sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ==",
+               "dev": true
+            },
+            "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==",
+               "dev": true
+            }
          }
       },
       "emojis-list": {
@@ -6310,6 +6360,12 @@
          "integrity": "sha1-KzJxhOiZIQEXeyhWP7XnECrNDKk=",
          "dev": true
       },
+      "nice-try": {
+         "version": "1.0.5",
+         "resolved": "https://registry.npmjs.org/nice-try/-/nice-try-1.0.5.tgz",
+         "integrity": "sha512-1nh45deeb5olNY7eX82BkPO7SSxR5SSYJiPTrTdFUVYwAl8CKMA5N9PjTYkHiRjisVcxcQ1HXdLhx2qxxJzLNQ==",
+         "dev": true
+      },
       "no-case": {
          "version": "2.3.2",
          "resolved": "https://registry.npmjs.org/no-case/-/no-case-2.3.2.tgz",
@@ -7278,6 +7334,12 @@
          "integrity": "sha1-NlQX3t5EQw0cEa9hAn+s8HS9/FM=",
          "dev": true
       },
+      "path-key": {
+         "version": "2.0.1",
+         "resolved": "https://registry.npmjs.org/path-key/-/path-key-2.0.1.tgz",
+         "integrity": "sha1-QRyttXTFoUDTpLGRDUDYDMn0C0A=",
+         "dev": true
+      },
       "path-parse": {
          "version": "1.0.5",
          "resolved": "https://registry.npmjs.org/path-parse/-/path-parse-1.0.5.tgz",
@@ -10080,6 +10142,21 @@
             }
          }
       },
+      "shebang-command": {
+         "version": "1.2.0",
+         "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-1.2.0.tgz",
+         "integrity": "sha1-RKrGW2lbAzmJaMOfNj/uXer98eo=",
+         "dev": true,
+         "requires": {
+            "shebang-regex": "^1.0.0"
+         }
+      },
+      "shebang-regex": {
+         "version": "1.0.0",
+         "resolved": "https://registry.npmjs.org/shebang-regex/-/shebang-regex-1.0.0.tgz",
+         "integrity": "sha1-2kL0l0DAtC2yypcoVxyxkMmO/qM=",
+         "dev": true
+      },
       "shelljs": {
          "version": "0.7.8",
          "resolved": "https://registry.npmjs.org/shelljs/-/shelljs-0.7.8.tgz",