docs: problem resolution

Author: Alan Shaw

README.md

@@ -70,7 +70,7 @@ const crypto = require('libp2p-crypto')
 
 The `libp2p-crypto` library depends on the [Web Crypto API](https://developer.mozilla.org/en-US/docs/Web/API/Web_Crypto_API) in the browser. Web Crypto is available in all modern browsers, however browsers restrict its usage to [Secure Contexts](https://developer.mozilla.org/en-US/docs/Web/Security/Secure_Contexts).
 
-**This means you will not be able to use some `libp2p-crypto` functions in the browser when the page is served over HTTP.**
+**This means you will not be able to use some `libp2p-crypto` functions in the browser when the page is served over HTTP.** To enable the Web Crypto API and allow `libp2p-crypto` to work fully, please serve your page over HTTPS.
 
 ## API