restore inc/qcbor.h for backwards compatibility
diff --git a/inc/qcbor.h b/inc/qcbor.h
new file mode 100644
index 0000000..e5b23e6
--- /dev/null
+++ b/inc/qcbor.h
@@ -0,0 +1 @@
+#include "qcbor/qcbor.h"