cmd/govim: echoerr when user tries to load using a bad version of Vim #838
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Vim v8.2.0452 introduced a bug that affects govim, causing it to hang:
https://groups.google.com/forum/#!msg/vim_dev/AjQA8dE0EpY/miFlLh0PAwAJ
This bug was fixed in v8.2.0466.
Echo an error if the user is found to be using a bad version.
Fixes #837