Bump version to 0.9.91

Author: Gioee

src/cloudsync.h

@@ -17,7 +17,7 @@
 extern "C" {
 #endif
 
-#define CLOUDSYNC_VERSION                       "0.9.90"
+#define CLOUDSYNC_VERSION                       "0.9.91"
 #define CLOUDSYNC_MAX_TABLENAME_LEN             512
 
 #define CLOUDSYNC_VALUE_NOTSET                  -1