v0.3.1

• Merge #35 for ICD10 validation
• Merge #40 for edchiefcomplaint grouping which closes #36
• Improve regex matching of diag_NN, opertn and opdate
• Change edwaittime,timeined dtypes - fixes #32
• Update documentation

Contributors to code and testing:

• @ccarenzoIC
• @georgm8
• @MattStammers (maybe there will be a v0.4.0 after all 😄 )
• @quindavies

And as always, thanks to Sheffield SCHARR Institute, HDRUK and the entire team for a great collaborative project. 🔥 💣 🚀