Update README a little

README.md

@@ -11,10 +11,10 @@ In the absence of a project name: This is my master's thesis
 There isn't much to see, yet. To see pretty printed parse results,
 use:
 
-    stack exec ma -- FILENAME
+    stack exec ma < FILENAME
 
-Where `FILENAME` is a yaml file describing the input. There is an
-example in `examples/example.yaml`.
+Where `FILENAME` is a file describing the input. Examples are in
+`examples/`.
 
 ## API documentation