1. renamed lib to to spitlog

2. Rotating bugfix

include/spitlog/sinks/sink.h

@@ -0,0 +1,17 @@
+#pragma once
+
+#include "../details/log_msg.h"
+
+namespace spitlog
+{
+namespace sinks
+{
+class sink
+{
+public:
+    virtual ~sink() {}
+    virtual void log(const details::log_msg& msg) = 0;
+};
+}
+}
+