feat: Update `music` icon

Bumps [https-proxy-agent](https://github.com/TooTallNate/node-https-proxy-agent) from 2.1.1 to 2.2.1. **This update includes security fixes.**
- [Release notes](https://github.com/TooTallNate/node-https-proxy-agent/releases)
- [Changelog](https://github.com/TooTallNate/node-https-proxy-agent/blob/master/History.md)
- [Commits](https://github.com/TooTallNate/node-https-proxy-agent/compare/2.1.1...2.2.1)
Signed-off-by: dependabot[bot] <support@dependabot.com>

Bumps [merge](https://github.com/yeikos/js.merge) from 1.2.0 to 1.2.1. **This update includes security fixes.**
- [Release notes](https://github.com/yeikos/js.merge/releases)
- [Commits](https://github.com/yeikos/js.merge/compare/v1.2.0...v1.2.1)
Signed-off-by: dependabot[bot] <support@dependabot.com>

Bumps [sshpk](https://github.com/joyent/node-sshpk) from 1.13.1 to 1.15.2. **This update includes security fixes.**
- [Release notes](https://github.com/joyent/node-sshpk/releases)
- [Commits](https://github.com/joyent/node-sshpk/compare/v1.13.1...v1.15.2)
Signed-off-by: dependabot[bot] <support@dependabot.com>

Bumps [stringstream](https://github.com/mhart/StringStream) from 0.0.5 to 0.0.6. **This update includes security fixes.**
- [Release notes](https://github.com/mhart/StringStream/releases)
- [Commits](https://github.com/mhart/StringStream/compare/v0.0.5...v0.0.6)
Signed-off-by: dependabot[bot] <support@dependabot.com>

* Create icon_request.md

* Delete ISSUE_TEMPLATE.md

* Create bug_report.md

* creating an example bug report

* Using same bug report from issue template

build: bump core-js from 2.5.3 to 2.5.6

Prevents webpack from referencing `window` in the UMD build which was causing an error in node.

Bumps [core-js](https://github.com/zloirock/core-js) from 2.5.3 to 2.5.6.
- [Release notes](https://github.com/zloirock/core-js/releases)
- [Changelog](https://github.com/zloirock/core-js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/zloirock/core-js/compare/v2.5.3...v2.5.6)
Signed-off-by: dependabot[bot] <support@dependabot.com>

Removes polyfills for `Object.assign` and `Set` which, as far as I can tell, are unused in the
codebase. Updates `webpack` from 3 to 4. Replaces `babel-preset-es2015` with `babel-preset-env`.
Reduces the minified bundle size (`feather.min.js`) by **9.3kB** (72.4kB to 63.1kB). Does not change
any functionality of the library.