fix: upgrade big-integer from 1.6.36 to 1.6.48 (#906)

Snyk has created this PR to upgrade big-integer from 1.6.36 to 1.6.48.

See this package in npm:
https://www.npmjs.com/package/big-integer

See this project in Snyk:
https://app.snyk.io/org/kspearrin/project/b65e7285-af54-4885-9245-af6852f0790a?utm_source=github&utm_medium=upgrade-pr

package-lock.json

@@ -1406,9 +1406,9 @@
       }
     },
     "big-integer": {
-      "version": "1.6.36",
-      "resolved": "https://registry.npmjs.org/big-integer/-/big-integer-1.6.36.tgz",
-      "integrity": "sha512-t70bfa7HYEA1D9idDbmuv7YbsbVkQ+Hp+8KFSul4aE5e/i1bjCNIRYJZlA8Q8p0r9T8cF/RVvwUgRA//FydEyg=="
+      "version": "1.6.48",
+      "resolved": "https://registry.npmjs.org/big-integer/-/big-integer-1.6.48.tgz",
+      "integrity": "sha512-j51egjPa7/i+RdiRuJbPdJ2FIUYYPhvYLjzoYbcMMm62ooO6F94fETG4MTs46zPAF9Brs04OajboA/qTGuz78w=="
     },
     "big.js": {
       "version": "3.2.0",

package.json

@@ -77,7 +77,7 @@
     "@microsoft/signalr-protocol-msgpack": "3.1.13",
     "angular2-toaster": "8.0.0",
     "angulartics2": "9.1.0",
-    "big-integer": "1.6.36",
+    "big-integer": "1.6.48",
     "bootstrap": "4.3.1",
     "braintree-web-drop-in": "1.13.0",
     "browser-hrtime": "^1.1.8",