#1754 Require snake_case names for linters in the codebase

ale_linters/sml/smlnj_cm.vim

@@ -9,7 +9,8 @@ endfunction
 " Using CM requires that we set "lint_file: 1", since it reads the files
 " from the disk itself.
 call ale#linter#Define('sml', {
-\   'name': 'smlnj-cm',
+\   'name': 'smlnj_cm',
+\   'aliases': ['smlnj-cm'],
 \   'executable_callback': 'ale#handlers#sml#GetExecutableSmlnjCm',
 \   'lint_file': 1,
 \   'command_callback': 'ale_linters#sml#smlnj_cm#GetCommand',