Revert code examples in readme to CommonJS format for time being

README.md

@@ -39,7 +39,7 @@ npm i @small-tech/https
 ### At localhost with automatically-provisioned development certificates via mkcert.
 
 ```js
-import https from '@small-tech/https'
+const https = require('@small-tech/https')
 
 const server = https.createServer((request, response) => {
   response.end('Hello, world!')
@@ -55,8 +55,8 @@ Hit `https://localhost` and you should see your site with locally-trusted TLS ce
 ### At hostname with automatically-provisioned Let’s Encrypt certificates.
 
 ```js
-import https from '@small-tech/https'
-import os form 'os'
+const https = require('@small-tech/https')
+const os = require('os')
 
 const hostname = os.hostname()
 const options = { domains: [hostname] }