clarify conformance tests

Author: mr-c

README.rst

@@ -43,19 +43,19 @@ system link or `another facility <https://wiki.debian.org/DebianAlternatives>`_.
 Running tests locally
 ---------------------
 
--  Running unnittests ``(/tests)``:
+-  Running basic tests ``(/tests)``:
 
 .. code:: bash
 
     python setup.py test
 
--  Running conformance tests:
+-  Running the entire suite of CWL conformance tests:
 
-The conformance tests are intended to test feature coverage of a CWL
-implementation. It uses the module “cwltool.cwltest” from the cwltool
-reference implementation.
+The GitHub repostiory for the CWL specifications contains a script that tests a CWL
+implementation against a wide array of valid CWL files using the [cwltest](https://github.com/common-workflow-language/cwltest)
+program
 
-These tests can be found in the Common Workflow Language Specification repository at https://github.com/common-workflow-language/common-workflow-language/blob/master/CONFORMANCE_TESTS.md
+Instructions for running these tests can be found in the Common Workflow Language Specification repository at https://github.com/common-workflow-language/common-workflow-language/blob/master/CONFORMANCE_TESTS.md
 
 Run on the command line
 -----------------------