update version;

Author: sisong

README.md

@@ -1,5 +1,5 @@
 # [HDiffPatch](https://github.com/sisong/HDiffPatch)
-[![release](https://img.shields.io/badge/release-v4.6.3-blue.svg)](https://github.com/sisong/HDiffPatch/releases) 
+[![release](https://img.shields.io/badge/release-v4.6.4-blue.svg)](https://github.com/sisong/HDiffPatch/releases) 
 [![license](https://img.shields.io/badge/license-MIT-blue.svg)](https://github.com/sisong/HDiffPatch/blob/master/LICENSE) 
 [![PRs Welcome](https://img.shields.io/badge/PRs-welcome-blue.svg)](https://github.com/sisong/HDiffPatch/pulls)
 [![+issue Welcome](https://img.shields.io/github/issues-raw/sisong/HDiffPatch?color=green&label=%2Bissue%20welcome)](https://github.com/sisong/HDiffPatch/issues)   

libHDiffPatch/HPatch/patch_types.h

@@ -38,7 +38,7 @@ extern "C" {
 
 #define HDIFFPATCH_VERSION_MAJOR    4
 #define HDIFFPATCH_VERSION_MINOR    6
-#define HDIFFPATCH_VERSION_RELEASE  3
+#define HDIFFPATCH_VERSION_RELEASE  4
 
 #define _HDIFFPATCH_VERSION          HDIFFPATCH_VERSION_MAJOR.HDIFFPATCH_VERSION_MINOR.HDIFFPATCH_VERSION_RELEASE
 #define _HDIFFPATCH_QUOTE(str) #str