python3Packages.srsly: 0.2.0 -> 1.0.1

srsly 2.0.0 is also released. But since spaCy/textacy are the only
dependencies and spaCy requires < 1.1.0, it probably makes more sense
to bump this to 1.0.1 for the time being.

And additional argument in favor of 1.0.1 is that 2.0.0 drops support
for Python 3.5.