Update NEventStore to v7.0.0#13

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marcoamendola wants to merge 3 commits intoliquidprojections:masterfrom

marcoamendola:master

Commits on Aug 14, 2019

Update xunit and add xunit.runner.visualstudio to execute tests inside VS2019
Marco Amendola
committed
Update NEventStore to 7.0.0 and fix b/changes and tests
Marco Amendola
committed
Update .nuspec in order to reference NEventStore 7.*
Marco Amendola
committed