Update README.md

demo-formatter/README.md

@@ -1,28 +1,16 @@
 # Cucumber Demo Formatter
 
-Examples of standalone formatters that produce output from `protobuf` formatters
-or [fake-cucumber](../fake-cucumber)
+This is a very simple implementation of a dtandalone Cucumber formatter. It reads messages generated by Cucumber's `message` formatter from `STDIN` and writes a report to `STDOUT`.
 
 If you are writing a new formatter, copy this code as a starting point.
 
 ## Usage
 
-You'll need a `cucumber-messages.bin` file with messages that your formatter can process.
-The simplest way to generate one of these is to run [fake-cucumber](../fake-cucumber)
-over the `.feature` files used as test data in [gherkin](../gherkin/testdata/good):
-
-```
-npm install -g fake-cucumber
-cd ../gherkin
-fake-cucumber --results=random testdata/good/*.feature > ../demo-formatter/cucumber-messages.bin
-cd ../demo-formatter
-ls -al
-```
-
-You now have a `cucumber-messages.bin` file. Let's process it with our formatter:
+You'll need a `messages.ndjson` file with messages that your formatter can process.
+The simplest way to generate one of these is to use Cucumber's built-in `message` formatter.
 
 ### Ruby
 
 ```
-cat cucumber-messages.bin | ruby/bin/cucumber-demo-formatter
+cat messages.ndjson | ruby/bin/cucumber-demo-formatter
 ```