Update a few library projects to target v8.1

Author: pjcollins

SlidingMenu/Mono.SlidingMenu/Mono.SlidingMenu.csproj

@@ -12,7 +12,7 @@
     <MonoAndroidAssetsPrefix>Assets</MonoAndroidAssetsPrefix>
     <MonoAndroidResourcePrefix>Resources</MonoAndroidResourcePrefix>
     <AssemblyName>Mono.SlidingMenu</AssemblyName>
-    <TargetFrameworkVersion>v4.4</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v8.1</TargetFrameworkVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>True</DebugSymbols>

tv/TvLeanback/Picasso/Picasso/PicassoDroid.csproj

@@ -10,7 +10,7 @@
     <RootNamespace>Picasso</RootNamespace>
     <AssemblyName>Picasso</AssemblyName>
     <FileAlignment>512</FileAlignment>
-    <TargetFrameworkVersion>v4.4</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v8.1</TargetFrameworkVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>

wear/SynchronizedNotifications/Common/Common.csproj

@@ -13,7 +13,7 @@
     <AndroidResgenFile>Resources\Resource.designer.cs</AndroidResgenFile>
     <AndroidUseLatestPlatformSdk>False</AndroidUseLatestPlatformSdk>
     <AssemblyName>Common</AssemblyName>
-    <TargetFrameworkVersion>v4.4</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v8.1</TargetFrameworkVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>