Update ch03tests/07CI.ipynb

fix unintended removal of newline?

Co-authored-by: David Pérez-Suárez <[email protected]>

Author: alessandrofelder

ch03tests/07CI.ipynb

@@ -72,4 +72,4 @@
  },
  "nbformat": 4,
  "nbformat_minor": 1
-}
+}