Perturbopy v0.6.5

In the current release, we update testsuite to make it more flexible for different calculation modes and architectures.

What's Changed

• Update tests documentation by @hurricane642 in #66
• Add functionality for the gpu testing by @hurricane642 in #65
• Update soflinking of files from wannier folder by @hurricane642 in #67
• Update version by @hurricane642 in #68

Full Changelog: v0.6.1...v0.6.5