Include into html as bundle

[open-contracts]

I'm trying to use the WalletConnectProvider with ethersjs. Since I'm using plain js/html in my project, I wanted to include the minified package by adding

<script charset="utf-8" src="https://unpkg.com/@walletconnect/web3-provider@1.7.8/dist/umd/index.min.js" type="text/javascript"> </script>

to my index.html. I do get a WalletConnectProvider object in the global scope, but I get a "WalletConnectProvider is not a constructor" error when I use it as instructed in the docs. But it doesn't behave like a function either.

Any tips?