Update target version for UWP sample viewer (#826)

Author: ZackAllen

src/UWP/ArcGISRuntime.UWP.Viewer/ArcGISRuntime.UWP.Viewer.csproj

@@ -12,7 +12,7 @@
     <AssemblyName>ArcGISRuntime</AssemblyName>
     <DefaultLanguage>en-US</DefaultLanguage>
     <TargetPlatformIdentifier>UAP</TargetPlatformIdentifier>
-    <TargetPlatformVersion Condition=" '$(TargetPlatformVersion)' == '' ">10.0.17763.0</TargetPlatformVersion>
+    <TargetPlatformVersion Condition=" '$(TargetPlatformVersion)' == '' ">10.0.18362.0</TargetPlatformVersion>
     <TargetPlatformMinVersion>10.0.17134.0</TargetPlatformMinVersion>
     <MinimumVisualStudioVersion>14</MinimumVisualStudioVersion>
     <EnableDotNetNativeCompatibleProfile>true</EnableDotNetNativeCompatibleProfile>