Renamed files bytesobject.[ch] and stringobject.[ch]
Fixed Windows build
diff --git a/Parser/tokenizer.c b/Parser/tokenizer.c
index 18fb122..487405f 100644
--- a/Parser/tokenizer.c
+++ b/Parser/tokenizer.c
@@ -12,7 +12,7 @@
 
 #ifndef PGEN
 #include "unicodeobject.h"
-#include "stringobject.h"
+#include "bytesobject.h"
 #include "fileobject.h"
 #include "codecs.h"
 #include "abstract.h"