Bug 513476: update README for trace-tests.py to reflect usage of tree-standard python 2.5, no_r=me

js/src/trace-test/README

@@ -7,13 +7,13 @@ with tracing enabled (-j).
 
 * REQUIREMENTS
 
-Python 3.1: http://www.python.org
+Python 2.5. This is already a standard requirement for building our tree.
 
 * RUNNING THE TESTS
 
 Basic usage:
 
-    python3.1 trace-test.py <path-to-js-shell>
+    python trace-test.py <path-to-js-shell>
 
 The progress bar shows [#tests passed, #tests failed, #tests run] at the left.
 If all tests pass, the output is 'PASSED ALL'. The test suite can be interrupted
@@ -21,11 +21,11 @@ at any time with Ctrl+C and partial results will be printed.
 
 To run only the basic tests, not including the slow tests:
 
-    python3.1 trace-test.py <path-to-js-shell> basic
+    python trace-test.py <path-to-js-shell> basic
 
 For more options:
 
-    python3.1 trace-test.py -h
+    python trace-test.py -h
 
 * CREATING NEW TESTS