Readme.md in parallel_tests-2.19.0 vs Readme.md in parallel_tests-2.20.0

@@ -211,10 +211,12 @@
     -t, --type [TYPE]                test(default) / rspec / cucumber / spinach
         --suffix [PATTERN]           override built in test file pattern (should match suffix):
           '_spec.rb$' - matches rspec files
           '_(test|spec).rb$' - matches test or spec files
         --serialize-stdout           Serialize stdout output, nothing will be written until everything is done
+        --prefix-output-with-test-env-number
+                                     Prefixes test env number to the output when not using --serialize-stdout
         --combine-stderr             Combine stderr into stdout, useful in conjunction with --serialize-stdout
         --non-parallel               execute same commands but do not in parallel, needs --exec
         --no-symlinks                Do not traverse symbolic links to find test files
         --ignore-tags [PATTERN]      When counting steps ignore scenarios with tags that match this pattern
         --nice                       execute test commands with low priority.
@@ -363,9 +365,10 @@
  - [Rhett Sutphin](https://github.com/rsutphin)
  - [Doc Ritezel](https://github.com/ohrite)
  - [Alexandre Wilhelm](https://github.com/dogild)
  - [Jerry](https://github.com/boblington)
  - [Aleksei Gusev](https://github.com/hron)
+ - [Scott Olsen](https://github.com/scottolsen)
 
 [Michael Grosser](http://grosser.it)<br/>
 [e-mail]<br/>
 License: MIT