Corrected default tab size to conventional 8 (#309)

.editorconfig

@@ -8,7 +8,8 @@ indent_style = space
 insert_final_newline = true
 # Default 120 is hardly reasonable on today's 4K monitors
 max_line_length = 200
-tab_width = 4
+# Eight. Not four. This makes it compatible with UNIX tools that honored this convention since before JetBrains existed.
+tab_width = 8
 trim_trailing_whitespace = true
 ij_continuation_indent_size = 8
 ij_formatter_off_tag = @formatter:off