docs(README): Update Axios example (#2464)

* fix(README): Update axios example

This was added with #1711 but [has changed with axios v1](axios/axios#5277)

README.md

@@ -1539,8 +1539,10 @@ import test from 'ava' // You can use any test framework.
 // can't be intercepted by nock. So, configure axios to use the node adapter.
 //
 // References:
+// https://github.com/axios/axios/pull/5277
 // https://github.com/nock/nock/issues/699#issuecomment-272708264
 // https://github.com/axios/axios/issues/305
+
 axios.defaults.adapter = 'http'
 
 test('can fetch test response', async t => {
@@ -1559,6 +1561,18 @@ test('can fetch test response', async t => {
 })
 ```
 
+For Nock + Axios + Jest to work, you'll have to also adapt your jest.config.js, like so:
+
+```js
+const config = {
+  moduleNameMapper: {
+    // Force CommonJS build for http adapter to be available.
+    // via https://github.com/axios/axios/issues/5101#issuecomment-1276572468
+    '^axios$': require.resolve('axios'),
+  },
+}
+```
+
 [axios]: https://github.com/axios/axios
 
 ### Memory issues with Jest