Log Message:
Update to 2.000028

Upstream changes:
2.000028 - 2021-10-17
 - fix skips in shell test when shell has unpredictable startup actions

2.000027 - 2021-10-14
 - releasing as stable

2.000_026 - 2021-10-11
 - fix output redirection used in fish shell to work with newer versions
 - fix optional function used on Win32 for finding the current directory

2.000_025 - 2020-07-30
 - add documentation for --quiet option
 - added --always option to always add requested directory to env vars, even
   if they are already included
 - improve shell test to be more resiliant against custom init scripts
 - improved test diagnostics
 - reorganized documentation for bootstrapping into a non-standard directory
 - remove mentions of File::HomeDir from documentation, as it is no longer
   used