Update readme

README.md

@@ -1,7 +1,5 @@
 # Spawnteract
 
-[![Greenkeeper badge](https://badges.greenkeeper.io/nteract/spawnteract.svg)](https://greenkeeper.io/)
-
 Spawn yourself a Jupyter kernel backend.
 
 ```
@@ -24,13 +22,26 @@ spawnteract.launch('python3').then(kernel => {
 })
 ```
 
-You'll need to close `kernel.spawn` yourself as well as delete `kernel.connectionFile` from disk when finished:
+`spawnteract` will automatically delete the connection file after the kernel
+process exits or errors out.
+
+To disable this feature, set `cleanupConnectionFile` to `false` in the `spawnOptions`:
+
+  ```js
+  launch(kernelName, { cleanupConnectionFile: false });
+  ```
+
+You'll should close `kernel.spawn` when a user shuts down the kernel. If you disabled automatic cleanup, you will need to delete `kernel.connectionFile` from disk when finished:
 
 ```js
 function cleanup(kernel) {
   kernel.spawn.kill();
+  // Only do this second part if you opted out of automatic cleanup:
   fs.unlink(kernel.connectionFile);
 }
 ```
 
+*For more info, see our [changelog](https://github.com/nteract/spawnteract/blob/master/CHANGELOG.md) 
+or open an issue with questions*
+
 You will probably end up wanting to use this with [enchannel-zmq-backend](https://github.com/nteract/enchannel-zmq-backend).