Release 0.5.8

* Adapt to rsass 0.9.8 (the sass feature now requires a compiler that
  supports edition 2018).
* More compact static data, using byte strings instead of numbers.
  (i.e. b"\xef\xbb\xbfabc" rather than [239, 187, 191, 65, 66, 67]).
* Minor internal cleanup.
* Update bytecount dependency.

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "ructe"
-version = "0.5.7-PRE"
+version = "0.5.8"
 authors = ["Rasmus Kaj <[email protected]>"]
 description = "Rust Compiled Templates, efficient type-safe web page templates."
 documentation = "https://docs.rs/ructe"