create rustfmt config file

figsoda · figsoda · commit 077a879826e7 · 2020-10-28T16:34:30.000-04:00
diff --git a/rustfmt.toml b/rustfmt.toml
@@ -0,0 +1,4 @@
+edition = "2018"
+format_code_in_doc_comments = true
+merge_imports = true
+newline_style = "unix"
