Merge pull request #946 from redboltz/update_to_13.1.0

Update the version to 13.1.0.

CHANGELOG.md

@@ -1,3 +1,10 @@
+## 13.1.0
+* Added clear username and password functionality. (#944)
+* Refined utility tools. (#941, #942)
+* Refined log disabling. (#940)
+* Fixed async_shutdown callback twice called problem. (#938)
+* Refined error handlling. (#937)
+
 ## 13.0.0
 * <<<< breaking change >>>> Minimum boost requirement is 1.74.0. (#934)
 * Modulized store. (#933)

README.md

@@ -1,6 +1,6 @@
 # MQTT client/server for C++14 based on Boost.Asio
 
-Version 13.0.0 [![Actions Status](https://github.com/redboltz/mqtt_cpp/workflows/CI/badge.svg)](https://github.com/redboltz/mqtt_cpp/actions)[![Build Status](https://dev.azure.com/redboltz/redboltz/_apis/build/status/redboltz.mqtt_cpp?branchName=master)](https://dev.azure.com/redboltz/redboltz/_build/latest?definitionId=6&branchName=master)[![codecov](https://codecov.io/gh/redboltz/mqtt_cpp/branch/master/graph/badge.svg)](https://codecov.io/gh/redboltz/mqtt_cpp)
+Version 13.1.0 [![Actions Status](https://github.com/redboltz/mqtt_cpp/workflows/CI/badge.svg)](https://github.com/redboltz/mqtt_cpp/actions)[![Build Status](https://dev.azure.com/redboltz/redboltz/_apis/build/status/redboltz.mqtt_cpp?branchName=master)](https://dev.azure.com/redboltz/redboltz/_build/latest?definitionId=6&branchName=master)[![codecov](https://codecov.io/gh/redboltz/mqtt_cpp/branch/master/graph/badge.svg)](https://codecov.io/gh/redboltz/mqtt_cpp)
 
 Important note https://github.com/redboltz/mqtt_cpp/wiki/News.