correct define tag

src/ImageSharp/Image.cs

@@ -44,7 +44,7 @@ namespace ImageSharp
         {
         }
 
-#if !NETSTANDARD11
+#if !NETSTANDARD1_1
         /// <summary>
         /// Initializes a new instance of the <see cref="Image"/> class.
         /// </summary>

src/ImageSharp/Image/Image{TColor}.cs

@@ -63,7 +63,7 @@ namespace ImageSharp
             this.Load(stream);
         }
 
-#if !NETSTANDARD11
+#if !NETSTANDARD1_1
         /// <summary>
         /// Initializes a new instance of the <see cref="Image{TColor}"/> class.
         /// </summary>
@@ -245,7 +245,7 @@ namespace ImageSharp
             return this;
         }
 
-#if !NETSTANDARD11
+#if !NETSTANDARD1_1
         /// <summary>
         /// Saves the image to the given stream using the currently loaded image format.
         /// </summary>

src/ImageSharp/project.json

@@ -68,9 +68,6 @@
       }
     },
     "netstandard1.1": {
-      "buildOptions": {
-        "define": [ "NETSTANDARD11" ]
-      },
       "dependencies": {
         "System.Collections": "4.0.11",
         "System.Diagnostics.Debug": "4.0.11",