Organise dependencies.

src/ImageSharp/project.json

@@ -28,6 +28,15 @@
     "additionalArguments": [ "/additionalfile:stylecop.json" ]
   },
   "dependencies": {
+    "StyleCop.Analyzers": {
+      "version": "1.0.0",
+      "type": "build"
+    }
+  },
+  "frameworks": {
+    "netstandard1.1": {
+      "dependencies": {
+        "System.Buffers": "4.0.0",
         "System.Collections": "4.0.11",
         "System.Diagnostics.Debug": "4.0.11",
         "System.Diagnostics.Tools": "4.0.1",
@@ -44,14 +53,18 @@
         "System.Text.Encoding.Extensions": "4.0.11",
         "System.Threading": "4.0.11",
         "System.Threading.Tasks": "4.0.11",
-    "System.Threading.Tasks.Parallel": "4.0.1",
+        "System.Threading.Tasks.Parallel": "4.0.1"
-    "StyleCop.Analyzers": {
+      }
-      "version": "1.0.0",
-      "type": "build"
     },
-    "System.Buffers": "4.0.0"
+    "net45": {
+      "dependencies": {
+        "System.Buffers": "4.0.0",
+        "System.Numerics.Vectors": "4.1.1",
+        "System.Runtime.CompilerServices.Unsafe": "4.0.0"
       },
-  "frameworks": {
+      "frameworkAssemblies": {
-    "netstandard1.1": {}
+        "System.Runtime": ""
+      }
+    }
   }
 }