remove vim-polyglot due to bug
remove vim-polyglot due to bug

While vim-polyglot provides improved syntax highlighting, having the
plugin installed caused a strange bug with vim-dispatch. Specifically,
if vim-polyglot is installed, when I call `:Dispatch` to run code
asynchronously, the Quickfix List window opens up (as normal) but then
the window closes automatically if the code exists with status code 0
(i.e. successful). As soon as I delete vim-polyglot, the behavior
returns to what I've been used to: the window appears and stays open
(regardless of the code outcome) until I close it. So something that
vim-polyglot is doing is changing the `:Dispatch` behavior. And while I
can open the closed window afterwords using `:Copen`, this breaks my
personal workflow enough that I'd rather just forgo using vim-polyglot
(for now at least).

Steps to reproduce:
1. install vim-dispatch and vim-polyglot to neovim using Plug
2. run `:Dispatch` inside neovim (e.g. `:Dispatch python %`)

Expected result: the Quickfix List window is opened at the bottom of
neovim and stays open regardless of whether the code runs successfully
or not

Actual result: the Quickfix List window is opened at the bottom of
neovim, but is automatically closed when the code run is successful
(exit code 0) and stays open when the code fails (exit code > 0)

OS: macOS 10.15.4
Tmux: 3.1, 3.1a and 3.1b (installed via Homebrew)
Neovim: v0.4.3 (installed via Homebrew)

dplarson/dotfiles,dplarson/dotfiles