Use IntelliJ-specific editor config options

Author: surol

.editorconfig

@@ -6,9 +6,9 @@ charset = utf-8
 max_line_length = 120
 indent_style = space
 indent_size = 2
-continuation_indent_size = 4
 insert_final_newline = true
 trim_trailing_whitespace = true
+ij_continuation_indent_size = 4
 
 [*.md]
 trim_trailing_whitespace = false