vim: add module-warn modulefile cmd

Signed-off-by: Xavier Delaruelle <[email protected]>

Author: xdelaruelle

share/vim/syntax/modulefile.vim

@@ -18,7 +18,7 @@ syn keyword modCommand  add-property always-load append-path chdir complete conf
 syn keyword modCommand  depends-on depends-on-any family getenv getvariant hide-modulefile
 syn keyword modCommand  hide-version is-avail is-loaded is-saved is-used lsb-release
 syn keyword modCommand  module module-alias module-forbid module-help module-hide
-syn keyword modCommand  module-info module-tag module-version module-virtual
+syn keyword modCommand  module-info module-tag module-version module-virtual module-warn
 syn keyword modCommand  module-whatis modulepath-label prepend-path prereq prereq-all
 syn keyword modCommand  prereq-any pushenv remove-path reportError reportWarning
 syn keyword modCommand  require-fullname set-alias set-function setenv source-sh system