Added a newline after start of codeblock

Author: sanjay-sridharan-personal

README.rst

@@ -38,6 +38,7 @@ missing library stubs or py.typed marker  [import-untyped]*. To resolve, run the
 following command to generate a requests_file.pyi in the current directory:
 
 .. code-block:: bash
+
     stubgen -o . -m requests_file
 
 Contributing