* Improve the implementation mechanism of queue mode. #96
* refactor the code .
* add Copyright & License description into header text of code files.
* refactor
* set version to 2.2.0
* update unit tests.
* add exception class to process the publish send and subscriber exectution exception
* modify first retry time to three.
* code refactor.
* add retry mechanism
* code refactor
* refactor consumer execution
* fix spell error
* remove dashboard `processing ` content.
* Modify the retry to retry the message only 4 minutes ago.
* update samples
* update ci configuration.
* Improve the implementation mechanism of queue mode. #96
* refactor the code .
* add Copyright & License description into header text of code files.
* refactor
* set version to 2.2.0
* update unit tests.
* add exception class to process the publish send and subscriber exectution exception
* modify first retry time to three.
* code refactor.
* add retry mechanism
* code refactor
* refactor consumer execution
* fix spell error
* remove dashboard `processing ` content.
* Modify the retry to retry the message only 4 minutes ago.
* update samples
* update ci configuration.
* Fixed the connection bug of getting message from table. #83
* update version to 2.1.4
* remove `TableNamePrefix` option from `MySqlOptions` to `EFOptions`. #84
* fixed entityframework rename table name prefix bug. #84
* fixed sql server scripts bug of create table scheme. #85
* fixed entityframework rename table name prefix bug. #84
* modify error message of logger write
* Fixed bug of the FailedRetryCount does not increase when raised SubscriberNotFoundException. #90
* Fixed thread safety issue about KafkaOptions. #89
* upgrade nuget package