webdriver: Merge pull request mozilla#75 from mozilla/v0.22

Update version number for release

Source-Repo: https://github.com/mozilla/webdriver-rust
Source-Revision: 87bbf8cf0808752b92b40d5f5befff38dde6d601

testing/webdriver/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "webdriver"
-version = "0.21.0"
+version = "0.22.0"
 authors = ["Mozilla Tools and Automation <tools@lists.mozilla.com>"]
 description = "Library implementing the wire protocol for the W3C WebDriver specification"
 documentation = "https://docs.rs/webdriver"