undo mistaken update of rusttype crate

Author: manuel-rhdt

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "harfbuzz_rs"
-version = "1.1.0"
+version = "1.1.1"
 authors = ["Manuel Reinhardt <manuel.rhdt@gmail.com>"]
 description = "A high-level interface to HarfBuzz, exposing its most important functionality in a safe manner using Rust."
 repository = "https://github.com/manuel-rhdt/harfbuzz_rs"
@@ -24,5 +24,5 @@ default = []
 
 [dependencies]
 harfbuzz-sys = ">= 0.3"
-rusttype = { version = ">= 0.7", optional = true }
+rusttype = { version = ">= 0.7, <0.9", optional = true }
 bitflags = "^1"