Fix issue when running tests on full framework

Author: khellang

NuGet.config

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<configuration>
+  <packageSources>
+    <add key="myget.org xunit" value="https://www.myget.org/F/xunit/api/v3/index.json" />
+    <add key="api.nuget.org" value="https://api.nuget.org/v3/index.json" />
+  </packageSources>
+</configuration>

test/Serilog.Settings.Configuration.Tests/project.json

@@ -3,13 +3,17 @@
   "dependencies": {
     "Serilog.Settings.Configuration": { "target": "project" },
     "xunit": "2.1.0",
-    "dotnet-test-xunit": "1.0.0-rc2-build10015"
+    "dotnet-test-xunit": "1.0.0-rc3-build10019"
   },
   "buildOptions": {
     "keyFile": "../../assets/Serilog.snk"
   },
   "frameworks": {
-    "net4.6": { },
+    "net4.6": {
+      "dependencies": {
+        "Microsoft.NETCore.Platforms": "1.0.1-rc2-24027"
+      }
+    },
     "netcoreapp1.0": {
       "dependencies": {
         "Microsoft.NETCore.App": {
@@ -24,4 +28,3 @@
     }
   }
 }
-