docker warnings

[will-moore]

I'm seeing these warnings. Don't know if that means something is broken?

$ $ docker build -t training-notebooks .
...
Step 22/24 : RUN cd /opt/omero &&     /opt/conda/envs/python2/bin/pip install -q omego &&     /opt/conda/envs/python2/bin/omego download -q --sym OMERO.server server --release $OMERO_VERSION &&     rm OMERO.server-*.zip
 ---> Running in 092d608a681a
notebook 5.7.4 has requirement pyzmq>=17, but you'll have pyzmq 15.3.0 which is incompatible.
You are using pip version 10.0.1, however version 19.2.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.

[jburel]

Just warning nothing broken