Remove bn.js dependency

packages/faucet/package.json

@@ -40,7 +40,6 @@
     "@iov/multichain": "^2.0.0-alpha.7",
     "@koa/cors": "^3.0.0",
     "axios": "^0.19.0",
-    "bn.js": "^5.1.1",
     "fast-deep-equal": "^3.1.1",
     "koa": "^2.11.0",
     "koa-bodyparser": "^4.2.1",
@@ -48,7 +47,6 @@
     "xstream": "^11.11.0"
   },
   "devDependencies": {
-    "@types/bn.js": "^4.11.6",
     "@types/koa": "^2.11.0",
     "@types/koa-bodyparser": "^4.3.0",
     "@types/koa__cors": "^3.0.1"

yarn.lock

@@ -1002,13 +1002,6 @@
   dependencies:
     "@types/node" "*"
 
-"@types/bn.js@^4.11.6":
-  version "4.11.6"
-  resolved "https://registry.yarnpkg.com/@types/bn.js/-/bn.js-4.11.6.tgz#c306c70d9358aaea33cd4eda092a742b9505967c"
-  integrity sha512-pqr857jrp2kPuO9uRjZ3PwnJTjoQy+fcdxvBTvHm6dkmEL9q+hDD/2j/0ELOBPtPnS8LjCX0gI9nbl8lVkadpg==
-  dependencies:
-    "@types/node" "*"
-
 "@types/body-parser@*":
   version "1.17.1"
   resolved "https://registry.yarnpkg.com/@types/body-parser/-/body-parser-1.17.1.tgz#18fcf61768fb5c30ccc508c21d6fd2e8b3bf7897"
@@ -1854,11 +1847,6 @@ bn.js@^4.0.0, bn.js@^4.1.0, bn.js@^4.1.1, bn.js@^4.11.8, bn.js@^4.4.0:
   resolved "https://registry.yarnpkg.com/bn.js/-/bn.js-4.11.8.tgz#2cde09eb5ee341f484746bb0309b3253b1b1442f"
   integrity sha512-ItfYfPLkWHUjckQCk8xC+LwxgK8NYcXywGigJgSwOP8Y2iyWT4f2vsZnoOXTTbo+o5yXmIUJ4gn5538SO5S3gA==
 
-bn.js@^5.1.1:
-  version "5.1.1"
-  resolved "https://registry.yarnpkg.com/bn.js/-/bn.js-5.1.1.tgz#48efc4031a9c4041b9c99c6941d903463ab62eb5"
-  integrity sha512-IUTD/REb78Z2eodka1QZyyEk66pciRcP6Sroka0aI3tG/iwIdYLrBD62RsubR7vqdt3WyX8p4jxeatzmRSphtA==
-
 body-parser@^1.16.1:
   version "1.19.0"
   resolved "https://registry.yarnpkg.com/body-parser/-/body-parser-1.19.0.tgz#96b2709e57c9c4e09a6fd66a8fd979844f69f08a"