Why not next release version as 1.0

[jeroenhabets]

This library has been successfully used by many companies (though difficult to get data, I personally know of at least a handful) so why the 0.2..-alpha version.

• The core of LTI Advantage is covered, so the existing API will most likely no longer change.
• It's being used successfully for years
• Someone stumbling on this library may be off put by the 0.x / alpha version
• Some companies have a mature versions only policy (1.0 or even 1.1)

So @srijken why not do a release soon and call it 1.0?

[jeroenhabets]

Fantastic @srijken 🥇 !

1.0 has been released, i.e. https://www.nuget.org/packages/LtiAdvantage/1.0.0

Closing #79