Target netstandard1.3

src/Microsoft.AspNetCore.Hosting/Startup/StartupExceptionPage.cs

@@ -236,7 +236,7 @@ namespace Microsoft.AspNetCore.Hosting
             var environment = PlatformServices.Default.Runtime;
             var runtimeType = HtmlEncodeAndReplaceLineBreaks(environment.RuntimeType);
             var runtimeDisplayName = runtimeType == "CoreCLR" ? ".NET Core" : runtimeType == "CLR" ? ".NET Framework" : "Mono";
-#if NETSTANDARD1_5
+#if NETSTANDARD1_3
             var systemRuntimeAssembly = typeof(System.ComponentModel.DefaultValueAttribute).GetTypeInfo().Assembly;
             var assemblyVersion = new AssemblyName(systemRuntimeAssembly.FullName).Version.ToString();
             var clrVersion = HtmlEncodeAndReplaceLineBreaks(assemblyVersion);

src/Microsoft.AspNetCore.Hosting/project.json

@@ -55,7 +55,7 @@
         }
       }
     },
-    "netstandard1.5": {
+    "netstandard1.3": {
       "dependencies": {
         "System.Console": "4.0.0-*",
         "System.Diagnostics.StackTrace": "4.0.1-*",

src/Microsoft.AspNetCore.TestHost/project.json

@@ -29,7 +29,7 @@
         "System.Net.Http": ""
       }
     },
-    "netstandard1.5": {
+    "netstandard1.3": {
       "dependencies": {
         "System.Diagnostics.Contracts": "4.0.1-*",
         "System.Net.Http": "4.1.0-*"