Merge pull request #976 from redboltz/update_to_c_4

Updated the version to 4.0.0.

CHANGELOG.md

+# 2021-08-01 version 4.0.0
+  * Fix and improve alignment logic (#962)
+  * Fix iovec name conflict (#953)
+  * Fix empty string print (#942)
+  * Fix buffer ptr size (#899)
+  * Fix UB. Check null pointer before using memcpy() (#890)
+  * Improve CI environment (#885, #899)
+
+## << breaking changes >>
+* Separate C part of the msgpack-c from C/C++ mixed msgpack-c (#876, #878)
+
+
 # 2020-06-05 version 3.3.0
   * Add json example for C (#870)
   * Add both header and body packing functions for C (#870)

README.md

 `msgpack` for C
 ===================
 
-Version 3.3.0 [![Build Status](https://github.com/msgpack/msgpack-c/workflows/CI/badge.svg?branch=c_master)](https://github.com/msgpack/msgpack-c/actions) [![Build status](https://ci.appveyor.com/api/projects/status/8kstcgt79qj123mw/branch/c_master?svg=true)](https://ci.appveyor.com/project/redboltz/msgpack-c/branch/c_master)
+Version 4.0.0 [![Build Status](https://github.com/msgpack/msgpack-c/workflows/CI/badge.svg?branch=c_master)](https://github.com/msgpack/msgpack-c/actions) [![Build status](https://ci.appveyor.com/api/projects/status/8kstcgt79qj123mw/branch/c_master?svg=true)](https://ci.appveyor.com/project/redboltz/msgpack-c/branch/c_master)
 [![codecov](https://codecov.io/gh/msgpack/msgpack-c/branch/c_master/graph/badge.svg)](https://codecov.io/gh/msgpack/msgpack-c/branch/c_master)
 
 It's like JSON but smaller and faster.

appveyor.yml

-version: 3.3.0.{build}
+version: 4.0.0.{build}
 
 branches:
   only:

include/msgpack/version_master.h

-#define MSGPACK_VERSION_MAJOR    3
-#define MSGPACK_VERSION_MINOR    3
+#define MSGPACK_VERSION_MAJOR    4
+#define MSGPACK_VERSION_MINOR    0
 #define MSGPACK_VERSION_REVISION 0

makedist.sh

@@ -18,6 +18,7 @@ tar cf $filename $prefix/example
 tar --append --file=$filename $prefix/test
 tar --append --file=$filename $prefix/include
 tar --append --file=$filename $prefix/src
+tar --append --file=$filename $prefix/cmake
 
 tar --append --file=$filename $prefix/CMakeLists.txt
 tar --append --file=$filename $prefix/Files.cmake