chore(fmt): add rustfmt config

fMeow · fMeow · commit 06be177571e7 · 2020-01-15T14:10:36.000+08:00
diff --git a/.rustfmt.toml b/.rustfmt.toml
@@ -0,0 +1,6 @@
+reorder_imports = true
+format_code_in_doc_comments = true
+normalize_doc_attributes = true
+wrap_comments = true
+format_strings = true
+merge_imports = true
