Auto merge of #225 - servo:emilio-patch-1, r=SimonSapin

Bump procedural-masquerade to pick #224

<!-- Reviewable:start -->
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/rust-cssparser/225)
<!-- Reviewable:end -->

Author: bors-servo

procedural-masquerade/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "procedural-masquerade"
-version = "0.1.5"
+version = "0.1.6"
 authors = ["Simon Sapin <simon.sapin@exyr.org>"]
 description = "macro_rules for making proc_macro_derive pretending to be proc_macro"
 documentation = "https://docs.rs/procedural-masquerade/"