Added explicit dependencies

src/Discord.Net/project.json

@@ -20,11 +20,17 @@
   },
 
   "dependencies": {
-    "NETStandard.Library": "1.5.0-rc2-24027",
+    "Microsoft.Win32.Primitives": "4.0.1-rc2-24027",
     "Newtonsoft.Json": "8.0.3",
+    "System.Collections.Concurrent": "4.0.12-rc2-24027",
     "System.Collections.Immutable": "1.2.0-rc2-24027",
+    "System.IO.Compression": "4.1.0-rc2-24027",
+    "System.IO.FileSystem": "4.0.1-rc2-24027",
+    "System.Net.Http": "4.0.1-rc2-24027",
     "System.Net.Websockets.Client": "4.0.0-rc2-24027",
-    "System.Runtime.Serialization.Primitives": "4.1.1-rc2-24027"
+    "System.Reflection.Extensions": "4.0.1-rc2-24027",
+    "System.Runtime.Serialization.Primitives": "4.1.1-rc2-24027",
+    "System.Text.RegularExpressions": "4.0.12-rc2-24027"
   },
 
   "frameworks": {