move config.h to under picrin/

README.md

@@ -181,7 +181,7 @@ There is a chat room on chat.freenode.org, channel #picrin.
 
         $ make
 
-	If you are building picrin on other systems than x86_64, PIC_NAN_BOXING flag is automatically turned on (see include/config.h for detail).
+	If you are building picrin on other systems than x86_64, PIC_NAN_BOXING flag is automatically turned on (see include/picrin/config.h for detail).
 
 - install
 

include/picrin.h

@@ -41,7 +41,7 @@ extern "C" {
 #include "xfile/xfile.h"
 #include "xrope/xrope.h"
 
-#include "config.h"
+#include "picrin/config.h"
 #include "picrin/util.h"
 #include "picrin/value.h"