Strawberry Fields information.

Prints the installed version numbers for SF and its dependencies, and some system info. Please include this information in bug reports.


>>> sf.about()
Strawberry Fields: a Python library for continuous-variable quantum circuits.
Copyright 2018-2020 Xanadu Quantum Technologies Inc.

Python version:            3.6.8
Platform info:             Linux-5.0.0-36-generic-x86_64-with-debian-buster-sid
Installation path:         /home/josh/Dropbox/Work/Xanadu/sf_cloud/strawberryfields
Strawberry Fields version: 0.12.0-dev
Numpy version:             1.17.4
Scipy version:             1.3.0
Sympy version:             1.5
NetworkX version:          2.4
The Walrus version:        0.10.0
Blackbird version:         0.2.1
TensorFlow version:        2.0.0