Set diff=rust git attribute for rust files

bjorn3 · bjorn3 · commit 6210ee213439 · 2020-11-08T16:36:52.000+01:00
This gives nicer hunk headers Fixes #1095
diff --git a/.gitattributes b/.gitattributes
@@ -1 +1,2 @@
 * text=auto eol=lf
+*.rs diff=rust
