Titbits for future version

From README:

Feature ideas

Functions run most often outside of immediate namespace
Functions run that fail most often
Time Fns: https://github.com/clojure-emacs/cider/issues/477. Then can show "longest running fns".
REPL Summary: I spent x amount of time in this namespace today
Refactor ideas
Right now summary is refreshed all the time - I should make a better process of firing off deltas (i.e. registrations). Perhaps I should start by having a dedicated 'flash message' section of the spy buffer.
Refactor: Split out a separate interaction file.
Test: Do a ping