chore: Bump es6-error from 4.0.2 to 4.1.1 (#116) [ci skip]

Bumps [es6-error](https://github.com/bjyoungblood/es6-error) from 4.0.2 to 4.1.1.
- [Release notes](https://github.com/bjyoungblood/es6-error/releases)
- [Changelog](https://github.com/bjyoungblood/es6-error/blob/master/CHANGELOG.md)
- [Commits](bjyoungblood/es6-error@v4.0.2...v4.1.1)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Author: dependabot[bot]

packages/api/package.json

@@ -42,7 +42,7 @@
     "@parity/abi": "^4.0.2",
     "bignumber.js": "^8.0.1",
     "blockies": "0.0.2",
-    "es6-error": "4.0.2",
+    "es6-error": "4.1.1",
     "es6-promise": "^4.1.1",
     "eventemitter3": "^3.1.0",
     "isomorphic-fetch": "^2.2.1",

yarn.lock

@@ -2466,10 +2466,10 @@ es5-ext@^0.10.14, es5-ext@^0.10.35, es5-ext@^0.10.45, es5-ext@^0.10.9, es5-ext@~
     es6-symbol "~3.1.1"
     next-tick "1"
 
-es6-error@4.0.2:
-  version "4.0.2"
-  resolved "https://registry.yarnpkg.com/es6-error/-/es6-error-4.0.2.tgz#eec5c726eacef51b7f6b73c20db6e1b13b069c98"
-  integrity sha1-7sXHJurO9Rt/a3PCDbbhsTsGnJg=
+es6-error@4.1.1:
+  version "4.1.1"
+  resolved "https://registry.yarnpkg.com/es6-error/-/es6-error-4.1.1.tgz#9e3af407459deed47e9a91f9b885a84eb05c561d"
+  integrity sha512-Um/+FxMr9CISWh0bi5Zv0iOD+4cFh5qLeks1qhAopKVAJw3drgKbKySikp7wGhDL0HPeaja0P5ULZrxLkniUVg==
 
 es6-iterator@^2.0.1, es6-iterator@~2.0.3:
   version "2.0.3"