Simplify JSON file reading?

[SJaffa]

programming_with_python/_episodes/02-dictionaries.md

Line 355 in 19edfb7

j_objects[filename] = json.loads(f.read())

You can also use json.load(f), not sure if this is better/simpler? It abstracts the step of reading it into a string.

[SJaffa]

Completed in e95b850