Merge pull request #578 from betrusted-io/rustfmt

change rustfmt to track changes in nightly

rustfmt.toml

@@ -27,7 +27,7 @@ use_small_heuristics = "Max"
 
 # Unstable features below
 unstable_features = true
-version = "Two"
+style_edition = "2021"
 # code can be 110 characters, why not comments?
 comment_width = 110
 # quicker manual lookup