add "contributed by" in changelog

Author: evanw

CHANGELOG.md

@@ -29,6 +29,8 @@
 
     This should have no effect on existing code as this version change does not change Go's operating system support. It may remove certain reports from vulnerability scanners that detect which version of the Go compiler esbuild uses.
 
+    This PR was contributed by [@MikeWillCook](https://github.com/MikeWillCook).
+
 ## 0.25.0
 
 **This release deliberately contains backwards-incompatible changes.** To avoid automatically picking up releases like this, you should either be pinning the exact version of `esbuild` in your `package.json` file (recommended) or be using a version range syntax that only accepts patch upgrades such as `^0.24.0` or `~0.24.0`. See npm's documentation about [semver](https://docs.npmjs.com/cli/v6/using-npm/semver/) for more information.