Update usage

index.js

@@ -28,22 +28,7 @@ const stream = require('./stream')
 
 const usage = `
   Usage
-    $ fx [code ...]
-
-  Shortcuts
-    q or Esc or Ctrl+c    Exit                   
-    up or k               Move cursor up         
-    down or j             Move cursor down       
-    left or h             Collapse               
-    right or l            Expand                 
-    Shift+right or L      Expand all under cursor
-    e                     Expand all             
-    E                     Collapse all           
-    g                     Scroll to top          
-    G                     Scroll to bottom       
-    .                     Edit filter            
-    /                     Search                 
-    n                     Find next                  
+    $ fx [code ...]               
 
   Examples
     $ echo '{"key": "value"}' | fx 'x => x.key'