Updating README for doctests howto

doctests/README.md

@@ -2,8 +2,8 @@
 
 ## How to add an example
 
-Create regular python file in the current folder with meaningful name. It makes sense prefix example files with 
-command category (e.g. string, set, list, hash, etc) to make navigation in the folder easier. Files ending in *.py* 
+Create regular python file in the current folder with meaningful name. It makes sense prefix example files with
+command category (e.g. string, set, list, hash, etc) to make navigation in the folder easier. Files ending in *.py*
 are automatically run by the test suite.
 
 ### Special markup
@@ -18,14 +18,15 @@ Examples are standalone python scripts, committed to the *doctests* directory. T
 ```bash
 pip install -r requirements.txt
 pip install -r dev_requirements.txt
+pip install -r doctests/requirements.txt
 ```
 
-Note - the CI process, runs the basic ```black``` and ```isort``` linters against the examples. Assuming 
-the requirements above have been installed you can run ```black yourfile.py``` and ```isort yourfile.py``` 
+Note - the CI process, runs the basic ```black``` and ```isort``` linters against the examples. Assuming
+the requirements above have been installed you can run ```black yourfile.py``` and ```isort yourfile.py```
 locally to validate the linting, prior to CI.
 
 Just include necessary assertions in the example file and run
 ```bash
 sh doctests/run_examples.sh
 ```
-to test all examples in the current folder.
+to test all examples in the current folder.