Note neovim version

README.md

@@ -11,6 +11,8 @@ NOTE: Minimum Requirements Have Changed
 Our policy is to support the Vim version that's in the latest LTS of Ubuntu.
 That's currently Ubuntu 20.04 which contains `vim-nox` at `v8.1.2269`.
 
+For neovim users, 0.4.4 is required.
+
 NOTE: Minimum compiler versions will soon be increased
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