updates README

README.md

@@ -21,8 +21,15 @@ The flow is :
 
 ```
 echo "Task number One" | section
-ls -l		       | output
+ls -l		       |& output
 echo "Warning"	       | output::warning
 ls /non_existent_file  |& output
 		       result
 ```
+
+## Todo list
+
+  * Have result optionnaly take a custom condition of success
+  * Parameters on output :
+    * Show errors as warning
+    * Silent output