Revert editorconfig-checker

Package is not ready for Windows yet.
editorconfig-checker/editorconfig-checker.javascript#387

Author: jerone

.editorconfig

@@ -10,5 +10,5 @@ charset = utf-8
 trim_trailing_whitespace = true
 insert_final_newline = true
 
-[tests\\**.ts]
+[tests/**.ts]
 trim_trailing_whitespace = false # Some spaces need to stay.