added missing header

include/spdlog/sinks/color_sinks.h

@@ -0,0 +1,12 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+#pragma once
+
+#ifdef _WIN32
+#include "wincolor_sink.h"
+#else
+#include "ansicolor_sink.h"
+#endif
+