UMD Releases don't exist

[Gabríel Arthúr Pétursson]

The README states:

As an alternative to using npm, you can obtain fetch.umd.js from the Releases section. The UMD distribution is compatible with AMD and CommonJS module loaders, as well as loading directly into a page via <script> tag.

The release section does not contain any fetch.umd.js files.

[Jake Champion]

thanks for the issue, we no longer make umd releases, i've now removed this from the readme