bug: incorrect filetype for paste window

[mikesmithgh]

The paste window populates the filetype based on vim.o.shell. But, the SHELL environment variable does not always reflect the correct shell. For example, if I am in bash and enter a fish shell, then vim.o.shell and $SHELL are still set to bash.

See #253 (comment)

Figure out a more appropriate way to detect the shell for the paste window filetype.

[mikesmithgh]

🎉 This issue has been resolved in version 4.3.6 🎉

The release is available on GitHub release

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