add how to run examples in README

README.rst

@@ -50,11 +50,10 @@ Development
 
     pip install -r requirements.txt
 
-* Add PYTHONPATH env var to your shell containing the path to this repository
 * Take a look at examples folder
 * Run examples from parent folder::
 
-    python examples/request_data.py
+    PYTHONPATH=`pwd` python examples/request_data.py
 
 * Before submit a merge requests, please check the static typing and tests.