Reacting to CoreCLR package changes

src/Microsoft.AspNetCore.Razor.Runtime/TagHelpers/DefaultTagHelperContent.cs

@@ -311,7 +311,7 @@ namespace Microsoft.AspNetCore.Razor.TagHelpers
 
             public bool IsWhiteSpace { get; private set; } = true;
 
-#if NETSTANDARD1_3
+#if NETSTANDARD1_5
             // This is an abstract method in DNXCore
             public override void Write(char value)
             {

src/Microsoft.AspNetCore.Razor.Runtime/project.json

@@ -54,7 +54,7 @@
         "System.Xml.Linq": "4.0.0.0"
       }
     },
-    "netstandard1.3": {
+    "netstandard1.5": {
       "dependencies": {
         "System.Collections.Concurrent": "4.0.12-*",
         "System.Reflection": "4.1.0-*",
@@ -64,7 +64,7 @@
         "System.Xml.XDocument": "4.0.11-*"
       },
       "imports": [
-        "dotnet5.4"
+        "dotnet5.6"
       ]
     }
   }