Remove obsolete protobuf stuff

README.md

@@ -1,28 +1,19 @@
 # Fake Cucumber
 
-Future implementations of Cucumber will have a `protobuf` formatter that produces
-output in [cucumber-messages](../cucumber-messages) format.
-
-The `fake-cucumber` command line tool produces the same kind of output as those
-`protobuf` formatters will. It parses your `.feature` files and produces fake
-results, so no step definitions are needed - only `.feature` files.
-
-The purpose of `fake-cucumber` is to generate test data for formatters that 
-will consume messages provided by `protobuf` formatters.
+Fake Cucumber is a simple reference implementation of Cucumber.
+It is primarily used to produce test data (cucumber messages).
 
 ## Usage
 
 Using npm:
 
 ```
 npm install -g fake-cucumber
-fake-cucumber [--format=json|ndjson|protobuf] [FILES]
+fake-cucumber [FILES]
 ```
 
 Alternatively, using docker:
 
 ```  
-docker run -v $(pwd)/features:/tmp/features cucumber/fake-cucumber:latest \
-  [--format=json|ndjson|protobuf] [FILES]
+docker run -v $(pwd)/features:/tmp/features cucumber/fake-cucumber:latest [FILES]
 ```
-