fix path separator of minisnip_dir

[mattn]

path separator on Windows should be ';' not ':'

[codecov-io]

Codecov Report

Merging #1698 into master will not change coverage.
The diff coverage is 0%.

@@          Coverage Diff           @@
##           master   #1698   +/-   ##
======================================
  Coverage    19.7%   19.7%           
======================================
  Files          57      57           
  Lines        4735    4735           
======================================
  Hits          933     933           
  Misses       3802    3802

Flag	Coverage Δ
#nvim	15.1% <0%> (ø)	⬆️
#vim74	17.31% <0%> (ø)	⬆️
#vim80	18.62% <0%> (ø)	⬆️

Impacted Files	Coverage Δ
ftplugin/go/snippets.vim	0% <0%> (ø)	⬆️

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[arp242]

Thanks!