Pin dependency bn.js to 5.1.1

Author: renovate-bot

package.json

@@ -36,7 +36,7 @@
     "@babel/preset-env": "7.9.6",
     "@babel/register": "7.9.0",
     "ava": "3.8.1",
-    "bn.js": "^5.1.1",
+    "bn.js": "5.1.1",
     "coveralls": "3.1.0",
     "esdoc": "1.1.0",
     "esdoc-inject-script-plugin": "1.0.0",

yarn.lock

@@ -1355,7 +1355,7 @@ blueimp-md5@^2.10.0:
   resolved "https://registry.yarnpkg.com/blueimp-md5/-/blueimp-md5-2.13.0.tgz#07314b0c64dda0bf1733f96ce40d5af94eb28965"
   integrity sha512-lmp0m647R5e77ORduxLW5mISIDcvgJZa52vMBv5uVI3UmSWTQjkJsZVBfaFqQPw/QFogJwvY6e3Gl9nP+Loe+Q==
 
-bn.js@^5.1.1:
+[email protected]:
   version "5.1.1"
   resolved "https://registry.yarnpkg.com/bn.js/-/bn.js-5.1.1.tgz#48efc4031a9c4041b9c99c6941d903463ab62eb5"
   integrity sha512-IUTD/REb78Z2eodka1QZyyEk66pciRcP6Sroka0aI3tG/iwIdYLrBD62RsubR7vqdt3WyX8p4jxeatzmRSphtA==