Examples and README out of date

[JPchico]

I was trying the lammps plugin after the syncing to make it compatible to AiiDA 1.4 and I noticed that the examples and README.md are out of date. Namely they refer to the need to pass the structure when defining the lammps.potential, this seems to have been removed in 71fa4c4

I can make a PR and fix these issues if that is okay.

[chrisjsewell]

sounds good to me thanks 😄

[JPchico]

@chrisjsewell The examples and the README.md are all updated. I only did not update the launch_lammps_combinate.py
The potential is passed as inputs.potential = Dict(dict=potential) I do not know if this is due to some difference on how the potential is treated in this particular workchain in comparison with the others.

[chrisjsewell]

Brilliant cheers I'll try and have a look ASAP. Yeh the combinate stuff was not written by me and I've never used it, so you probably know as well as me lol

[JPchico]

Fixed via #19 .