Ban use of ==# or ==? in the codebase, and prefer is# or is? instead

ale_linters/ruby/brakeman.vim

@@ -33,7 +33,7 @@ endfunction
 function! ale_linters#ruby#brakeman#GetCommand(buffer) abort
     let l:rails_root = ale#ruby#FindRailsRoot(a:buffer)
 
-    if l:rails_root ==? ''
+    if l:rails_root is? ''
         return ''
     endif