Update readme

Author: voxpelli

README.md

@@ -1,27 +1,26 @@
 # Async Iterable Prefetch
 
-TODO: Fill in
-
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+
+**WORK IN PROGRESS – early unpolished prerelease**
 
 ## Usage
 
 ### Simple
 
 ```javascript
-const { map } = require('buffered-async-iterable');
+import { map } from 'buffered-async-iterable';
 
-(async () => {
-  const mappedData = map(asyncIterable, async (item) => {
-    // Apply additional async lookup / processing
-  });
+const mappedData = map(asyncIterable, async (item) => {
+  // Apply additional async lookup / processing
+});
 
-  for await (const item of mappedData) {
-    // Consume the buffered async iterable
-  }
-})();
+for await (const item of mappedData) {
+  // Consume the buffered async iterable
+}
 ```
-
-TODO: Add syntax documentation