Replace column number with virtual column number

t/init.vim

@@ -44,7 +44,7 @@ describe 'init sections'
   it 'section z should be line numbers'
     Expect g:airline_section_z =~ '%3p%%'
     Expect g:airline_section_z =~ '%4l'
-    Expect g:airline_section_z =~ '%3c'
+    Expect g:airline_section_z =~ '%3v'
   end
 
   it 'should not redefine sections already defined'