README: Update section regarding how to run tests

jflesch · jflesch · commit 35ad40011d89 · 2018-06-11T08:54:28.000+02:00
Signed-off-by: Jerome Flesch &lt;jflesch@openpaper.work&gt;
diff --git a/README.markdown b/README.markdown
@@ -280,7 +280,8 @@ Beware this code hasn't been adapted to libtesseract 3 yet.
 ## Tests
 
 ```sh
-python ./run_tests.py
+make check  # requires pyflake8
+make test  # requires tox
 ```
 
 Tests are made to be run with the latest versions of Tesseract and Cuneiform.
