Add Redox to Tier 3

AdminXVII · AdminXVII · commit b05c3dc9d86f · 2020-05-19T22:48:11.000-04:00
diff --git a/README.md b/README.md
@@ -81,6 +81,9 @@ Tier 2:
   * x86_64-linux-android
   * x86_64-unknown-netbsd
 
+Tier 3:
+  * x86_64-unknown-redox
+
 ## Usage
 
 `nix` requires Rust 1.36.0 or newer.
