Bump url-parse from 1.4.7 to 1.5.1 in /examples/4-exchanges (#267)

Bumps [url-parse](https://github.com/unshiftio/url-parse) from 1.4.7 to 1.5.1.
- [Release notes](https://github.com/unshiftio/url-parse/releases)
- [Commits](unshiftio/url-parse@1.4.7...1.5.1)

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

examples/4-exchanges/yarn.lock

@@ -2504,9 +2504,9 @@ [email protected]:
   integrity sha1-sgmEkgO7Jd+CDadW50cAWHhSFiA=
 
 querystringify@^2.1.1:
-  version "2.1.1"
-  resolved "https://registry.yarnpkg.com/querystringify/-/querystringify-2.1.1.tgz#60e5a5fd64a7f8bfa4d2ab2ed6fdf4c85bad154e"
-  integrity sha512-w7fLxIRCRT7U8Qu53jQnJyPkYZIaR4n5151KMfcJlO/A9397Wxb1amJvROTK6TOnp7PfoAmg/qXiNHI+08jRfA==
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/querystringify/-/querystringify-2.2.0.tgz#3345941b4153cb9d082d8eee4cda2016a9aef7f6"
+  integrity sha512-FIqgj2EUvTa7R50u0rGsyTftzjYmv/a3hO345bZNrqabNqjtgiDMgmo4mkUjd+nzU5oF3dClKqFIPUKybUyqoQ==
 
 randombytes@^2.1.0:
   version "2.1.0"
@@ -3211,9 +3211,9 @@ urix@^0.1.0:
   integrity sha1-2pN/emLiH+wf0Y1Js1wpNQZ6bHI=
 
 url-parse@^1.4.3:
-  version "1.4.7"
-  resolved "https://registry.yarnpkg.com/url-parse/-/url-parse-1.4.7.tgz#a8a83535e8c00a316e403a5db4ac1b9b853ae278"
-  integrity sha512-d3uaVyzDB9tQoSXFvuSUNFibTd9zxd2bkVrDRvF5TmvWWQwqE4lgYJ5m+x1DbecWkw+LK4RNl2CU1hHuOKPVlg==
+  version "1.5.1"
+  resolved "https://registry.yarnpkg.com/url-parse/-/url-parse-1.5.1.tgz#d5fa9890af8a5e1f274a2c98376510f6425f6e3b"
+  integrity sha512-HOfCOUJt7iSYzEx/UqgtwKRMC6EU91NFhsCHMv9oM03VJcVo2Qrp8T8kI9D7amFf1cu+/3CEhgb3rF9zL7k85Q==
   dependencies:
     querystringify "^2.1.1"
     requires-port "^1.0.0"