Merge pull request #2124 from weseek/support/hide-version-context

replace class

src/server/views/widget/system-version.html

@@ -1,4 +1,4 @@
-<div class="system-version hidden-xs">
+<div class="system-version d-none d-md-block">
   <span>
     <a href="https://growi.org">GROWI</a> {{ growiVersion() }}
   </span>