Editorconfig file.

This change doesn't change the formatting of existing code, but makes sure all IDEs with support for this (VIM, Jetbrains IDEs, VS Code) use the same spacing style that `rustfmt` also uses by default. This makes a `cargo fmt` needless in most cases.

.editorconfig

@@ -0,0 +1,11 @@
+# top-most EditorConfig file
+root = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+indent_style = space
+indent_size = 4
+trim_trailing_whitespace = true

Changelog.md

@@ -1,7 +1,8 @@
 # TODO 0.12.2 / 0.13
 - internal improvements
-  - code formatting/style 
+  - code formatting/style
   - sensible style checks as optional CI job
+  - `.editorconfig` file
 
 # 0.12.1
 - `TagType`-enum introduced in `v0.11` is now actually public