Update nuget templates

nuget/template/Avalonia.Android.nuspec

@@ -16,11 +16,11 @@
       <dependency id="Serilog" version="1.5.14" />
       <dependency id="Splat" version="1.6.2" />
       <dependency id="Sprache" version="2.0.0.50" />
-      <dependency id="Rx-Core" version="2.2.5" />
-      <dependency id="Rx-Interfaces" version="2.2.5" />
-      <dependency id="Rx-Linq" version="2.2.5" />
-      <dependency id="Rx-Main" version="2.2.5" />
-      <dependency id="Rx-PlatformServices" version="2.2.5" />
+      <dependency id="System.Reactive" version="3.0.0" />
+      <dependency id="System.Reactive.Core" version="3.0.0" />
+      <dependency id="System.Reactive.Interfaces" version="3.0.0" />
+      <dependency id="System.Reactive.Linq" version="3.0.0" />
+      <dependency id="System.Reactive.PlatformServices" version="3.0.0" />
       <dependency id="Avalonia" version="#VERSION#" />
     </dependencies>
   </metadata>

nuget/template/Avalonia.Desktop.nuspec

@@ -16,11 +16,11 @@
       <dependency id="Serilog" version="1.5.14" />
       <dependency id="Splat" version="1.6.2" />
       <dependency id="Sprache" version="2.0.0.50" />
-      <dependency id="Rx-Core" version="2.2.5" />
-      <dependency id="Rx-Interfaces" version="2.2.5" />
-      <dependency id="Rx-Linq" version="2.2.5" />
-      <dependency id="Rx-Main" version="2.2.5" />
-      <dependency id="Rx-PlatformServices" version="2.2.5" />
+      <dependency id="System.Reactive" version="3.0.0" />
+      <dependency id="System.Reactive.Core" version="3.0.0" />
+      <dependency id="System.Reactive.Interfaces" version="3.0.0" />
+      <dependency id="System.Reactive.Linq" version="3.0.0" />
+      <dependency id="System.Reactive.PlatformServices" version="3.0.0" />
       <dependency id="SharpDX" version="3.0.2"/>
       <dependency id="SharpDX.Direct2D1" version="3.0.2"/>
       <dependency id="SharpDX.DXGI" version="3.0.2"/>

nuget/template/Avalonia.Skia.Desktop.nuspec

@@ -13,7 +13,7 @@
     <copyright>Copyright 2015</copyright>
     <tags>Avalonia</tags>
     <dependencies>
-      <dependency id="SkiaSharp" version="1.49.3.0-beta"/>
+      <dependency id="SkiaSharp" version="1.49.4.0-beta"/>
       <dependency id="Avalonia" version="#VERSION#" />
     </dependencies>
   </metadata>

nuget/template/Avalonia.iOS.nuspec

@@ -16,11 +16,11 @@
       <dependency id="Serilog" version="1.5.14" />
       <dependency id="Splat" version="1.6.2" />
       <dependency id="Sprache" version="2.0.0.50" />
-      <dependency id="Rx-Core" version="2.2.5" />
-      <dependency id="Rx-Interfaces" version="2.2.5" />
-      <dependency id="Rx-Linq" version="2.2.5" />
-      <dependency id="Rx-Main" version="2.2.5" />
-      <dependency id="Rx-PlatformServices" version="2.2.5" />
+      <dependency id="System.Reactive" version="3.0.0" />
+      <dependency id="System.Reactive.Core" version="3.0.0" />
+      <dependency id="System.Reactive.Interfaces" version="3.0.0" />
+      <dependency id="System.Reactive.Linq" version="3.0.0" />
+      <dependency id="System.Reactive.PlatformServices" version="3.0.0" />
       <dependency id="Avalonia" version="#VERSION#" />
     </dependencies>
   </metadata>

nuget/template/Avalonia.nuspec

@@ -16,11 +16,11 @@
       <dependency id="Serilog" version="1.5.14" />
       <dependency id="Splat" version="1.6.2" />
       <dependency id="Sprache" version="2.0.0.50" />
-      <dependency id="Rx-Core" version="2.2.5" />
-      <dependency id="Rx-Interfaces" version="2.2.5" />
-      <dependency id="Rx-Linq" version="2.2.5" />
-      <dependency id="Rx-Main" version="2.2.5" />
-      <dependency id="Rx-PlatformServices" version="2.2.5" />
+      <dependency id="System.Reactive" version="3.0.0" />
+      <dependency id="System.Reactive.Core" version="3.0.0" />
+      <dependency id="System.Reactive.Interfaces" version="3.0.0" />
+      <dependency id="System.Reactive.Linq" version="3.0.0" />
+      <dependency id="System.Reactive.PlatformServices" version="3.0.0" />
     </dependencies>
   </metadata>
 </package>