🐛 Fix a Ruby deprecation warning in the ERB linter (#4521)

* Fix a Ruby deprecation warning in the ERB linter

Before, the ERB linter used positional arguments. Newer versions of Ruby
have deprecated this method signature. We fixed the linter to use
keyword arguments.

* fixup! Fix a Ruby deprecation warning in the ERB linter

ale_linters/eruby/erb.vim

@@ -11,7 +11,7 @@ function! ale_linters#eruby#erb#GetCommand(buffer) abort
     " Rails-flavored eRuby does not comply with the standard as understood by
     " ERB, so we'll have to do some substitution. This does not reduce the
     " effectiveness of the linter—the translated code is still evaluated.
-    return 'ruby -r erb -e ' . ale#Escape('puts ERB.new($stdin.read.gsub(%{<%=},%{<%}), nil, %{-}).src') . '< %t | ruby -c'
+    return 'ruby -r erb -e ' . ale#Escape('puts ERB.new($stdin.read.gsub(%{<%=},%{<%}), trim_mode: %{-}).src') . '< %t | ruby -c'
 endfunction
 
 call ale#linter#Define('eruby', {

test/linter/test_erb.vader

@@ -13,4 +13,4 @@ Execute(Executable should filter invalid eRuby when inside a Rails project):
   call ale#test#SetFilename('../test-files/ruby/valid_rails_app/app/views/my_great_view.html.erb')
 
   AssertLinter 'erb',
-  \ 'ruby -r erb -e ' . ale#Escape('puts ERB.new($stdin.read.gsub(%{<%=},%{<%}), nil, %{-}).src') . '< %t | ruby -c'
+  \ 'ruby -r erb -e ' . ale#Escape('puts ERB.new($stdin.read.gsub(%{<%=},%{<%}), trim_mode: %{-}).src') . '< %t | ruby -c'