To get a summary of lines modified compared to origin: 
git fetch origin
git diff --stat origin/master
Example output: 
TODO                          | 8 ++++----
gate.py                       | 8 ++++++--
tests/test_gate.py            | 8 +++++++-
tests/test_quantum_circuit.py | 5 ++---
4 files changed, 19 insertions(+), 10 deletions(-)