Add an `actix` feature to provide a nicer error message (#57)

* Add an `actix` feature to provide a nicer error message
for people migrating from <= 0.8

* Fix tests.

* Bump version in readme.

1 files changed, 1 insertions, 1 deletions

diff --git a/README.md b/README.md
index c60b104..c5cf037 100644
--- a/README.md
+++ b/README.md
@@ -33,7 +33,7 @@ This crate works with Cargo and can be found on
 
 ```toml
 [dependencies]
-serde_qs = "0.8"
+serde_qs = "0.9"
 ```
 
 Minimum supported Rust version is 1.36.