fix: update readme to remove spy

README.md

@@ -77,24 +77,6 @@ results[0].expected.tersify()
 tersify(results[0])
 ```
 
-## spy(fn)
-
-You can use `spy(fn)` to spy on function and record the calls.
-It support 3 main case of async functions.
-They are all converted to Promise syntax so you can get the result using `call[n].then(...)`
-
-```ts
-import { spy } from 'satisfier'
-
-spy((a, b, cb) => { cb(a + 1, b - 1) })
-spy((options) => { options.success() })
-const spied = spy((a) => Promise.resolve(a + 1))
-await spied.fn(1)
-const callRecord = spied.calls[0]
-t.is(callRecord.arguments[0], 1)
-callRecord.then(result => t.is(result, 2))
-```
-
 ## Contribute
 
 ```sh