python pip version errors

@valentin.groues @jacek.lebioda

I'm installing clean version of the system, but I get this error/warning on pip install -r requirements.txt

django-otp 0.5.0 has requirement django>=1.11, but you'll have django 1.10.7 which is incompatible.
pyexcel-io 0.5.9.1 has requirement lml>=0.0.2, but you'll have lml 0.0.1 which is incompatible.
pyexcel-webio 0.1.4 has requirement pyexcel>=0.5.6, but you'll have pyexcel 0.5.3 which is incompatible.

The problem is that I didn't change anything in the requirements.txt so there should be no warnings... Is it possible that we (or just me) added those dependencies with invalid versions? And we are working on this unstable configuration for some time? Or do you think there might be another reason?

I don't want to change versions of the packages now