StevenVolckaert.Core targets .NETStandard 1.5 and .NETFramework 4.5.2, not .NETStandard 1.6.
StevenVolckaert.Core targets .NETStandard 1.5 and .NETFramework 4.5.2, not .NETStandard 1.6.

stevenvolckaert/enterprise-library