Migrate to .NET Standard 2.0. 🚚

[bchavez]

Migration to .NET Standard 2.0.

• Much cleaner code
• Got rid of a lot of assembly, csproj project, if-def hacks.

Good job Microsoft.

👈 👇 "Right here, Right now... Right here, Right now..."

[Mpdreamz]

Hey @bchavez any chance of reverting this?

This prevents me from using Bogus in netcoreapp1.1 dotnet core projects. Looking at the diff changeset here looks like its not a burden to keep supporting netstandard1.3

Would love to upgrade to make use of the local seeds 👍

[bchavez]

Hey @Mpdreamz. Sounds good. I'll take a look at re-targeting netstandard1.3.

Reference #101

[Mpdreamz]

🎉 🎈 🍰 thank you! :)