Update README.md

Author: michaelhush

README.md

@@ -95,7 +95,7 @@ pytest
 
 ## Usage
 
-See the [Jupyter notebooks](https://github.com/qctrl/notebooks/tree/master/qctrl-open-controls)
+See the [Jupyter notebooks](https://github.com/qctrl/notebooks/tree/master/qctrl-open-controls).
 
 ## Contributing