Add support for .NET 4.5.2

Former-commit-id: ee5f09ffb1e1e1eb96c2334ce017a0d530f8eb78
Former-commit-id: 2a8bc84046fb5f3c6bb2d831a5003a0e4baadd48
Former-commit-id: cf3c96e4547d0c4152fdd017fbc94fe07f85e3b2

src/ImageProcessorCore/project.json

@@ -13,6 +13,8 @@
   },
   "projectUrl": "",
   "licenseUrl": "",
+  "frameworks": {
+    "dotnet5.5": {
       "dependencies": {
         "System.Collections": "4.0.11-beta-23516",
         "System.Linq": "4.0.1-beta-23516",
@@ -26,8 +28,15 @@
         "StyleCop.Analyzers": "1.0.0",
         "Microsoft.NETCore": "5.0.1-beta-23516",
         "Microsoft.NETCore.Platforms": "1.0.1-beta-23516"
+      }
     },
-  "frameworks": {
+    "net452": {
-    "dotnet5.5": { }
+      "dependencies": {
+        "System.Numerics.Vectors": "4.0.0"
+      },
+      "frameworkAssemblies": {
+        "System.Runtime": ""
+      }
+    }
   }
 }