Release 20.0.0

Feature: Unity Package Manager support (#414, #455, #389) (Thanks to @pbhogan, @gekidoslair, @JamesMcGhee)
Feature: Update to Steamworks SDK 1.52 (#452)

Fixed: Various SteamNetworkingMessage_t improvements (#425)
Fixed: Fixup entrypoints for some SteamNetworkingSockets functions (#432)
Fixed: Fix crash in SteamParamStringArray deconstructor. (#440) (Thanks to @theace0296)
Fixed: Fix ISteamNetworkingUtils_GetConfigValue parameter from out -> ref. (#441)

Full Changelog: 15.0.1...20.0.0

Unity upgrading notice: Due to the new Unity package format you must completely remove Steamworks.NET if it's already in your project before importing.

Unity version notice: As of this version the minimum supported Unity Version is the LTS release "2019.4" due to the package support.

Unity Package Manager url: https://github.com/rlabrecque/Steamworks.NET.git?path=/com.rlabrecque.steamworks.net#20.0.0

Get the .unitypackage if you are using Unity.
The prebuilt "Standalone" package is for non-Unity projects ONLY.