Adding release action

Merge pull request #181 from janusw/release140

read me changes

Nuget 1.2.16

GH-147

Co-Authored-By: Sanjeev M <zeus82@users.noreply.github.com>

Added support for netstandard 2.0 and 2.1

New build process (#140)

* Experimenting with .net 3.5 framework location for DevOps build

* Adding new build icon to ReadMe for moving build to DevOps

Update GeoJSON.Net.csproj

#123

- coordinates are not validated against geographic coordinate bounds,…

… can now be any numeric

- assembly file version matching nuget package version

Appveyor badge

Removing validation that was put in for lat/long against the specs