* update version to 2.4.0

* Add version options to config file.

* update resource

* add  message version support  for dashboard

* add  message version support  for dashboard

* Support using version to isolate messages. #220

* update mongo unit tests

* update unit tests

* update unit tests

* Set default versions for consumer groups

* solve the problem of issue#181 (#237)

* Issue#235 (#238)

* solve the problem of issue#181

* solve the problem of issue#235

* refactor

* Fix the message persistence bug. #240

* using new CamelCaseNamingStrategy

* update packages to .net core 2.2

* update test framework to netcoreapp2.2

* Update .travis.yml

* update TargetFramework

* Exclude build samples project

* Update README.zh-cn.md

* Delete README.2.2.md

* Fix  flush unclaer data bugs.

* Update README.md

* Update README.md

* Update README.zh-cn.md

* update readme.md to add the subscriber group descriptions.

* update readme

* update version to 2.3.1

* add SnowflakeId unit tests

* update build.cake for unit test adjustment

* remove unused config file

* update readme

* update readme

* Fixed dashboard messages requeue error. ( #205 )

* Refactoring

* Fixed SnowflakeId workerId to random id.

* Update README.md

* upgrade dependent nuget packages.

* Add SourceLink Support

# Conflicts:
#	build/version.props
#	src/DotNetCore.CAP.PostgreSql/IStorageConnection.PostgreSql.cs
#	src/DotNetCore.CAP/Abstractions/CapPublisherBase.cs
#	src/DotNetCore.CAP/Dashboard/DashboardRoutes.cs
#	src/DotNetCore.CAP/LoggerExtensions.cs
#	src/DotNetCore.CAP/Models/CapPublishedMessage.cs
#	src/DotNetCore.CAP/Processor/IProcessor.NeedRetry.cs