Update neomodel to 4.0.3

[pyup-bot]

This PR updates neomodel from 4.0.1 to 4.0.3.

Changelog

4.0.3

* fix: "SemiStructuredNode can't have no props 493" (thank you dmp593)
* removed pytest as an installation requirement (553) (thank you mprahl)
* allow connection to bolt+s database URL schema (543) 
* typo fixes

4.0.2

* Minor updates

Links

• PyPI: https://pypi.org/project/neomodel
• Changelog: https://pyup.io/changelogs/neomodel/
• Repo: http://github.com/neo4j-contrib/neomodel

[coveralls]

Coverage remained the same at 86.413% when pulling ab31fba on pyup-update-neomodel-4.0.1-to-4.0.3 into 2a4f993 on master.

[whatSocks]

+1 for upgrading neomodel