Add support to .NET 9. (#62)

Add .NET 8 support. (#59)

Update to .NET 7. (#49)

Remove .NET Core 2.x testing (#40)

Remove .NET Core 2.x testing since Microsoft support to this version has expired. See https://docs.microsoft.com/en-us/lifecycle/products/microsoft-net-and-net-core

.NET 5 Release (#34)

* Bump version to v.1.0.0.
* .NET 5 Release
* Update .NET versions in the readme files.

Fix the null string validation. (#24)

* Fix the null string validation.
* Update version to 0.4.1.

20191219.1

Optimize the performance (#18)

* Optimize the performance of the CNPJ class.
* Optimize the performance of the CPF class.
* Implement more unit tests for the CPF validation.

Implemented Source Link. (#5)

* Enabled Source Link.
* Updated .NET SDK to v. 2.1.300 on Travis CI.
* Fixed missing documentation in the Debug configuration.

Updated version number to 0.2.5-alpha4.