geckodriver: cargo: can only have five keywords

Source-Repo: https://github.com/mozilla/geckodriver
Source-Revision: 186cc1ed029eaf751dd7bdbceb24ec0293640c24

--HG--
extra : rebase_source : 9da10c1963b6df8fda8542d48f6f04dbde198ca8

testing/geckodriver/Cargo.toml

@@ -6,7 +6,7 @@ authors = [
   "Andreas Tolfsen <ato@mozilla.com>",
 ]
 description = "Proxy for using WebDriver clients to interact with Gecko-based browsers."
-keywords = ["webdriver", "w3c", "proxy", "httpd", "mozilla", "firefox"]
+keywords = ["webdriver", "w3c", "httpd", "mozilla", "firefox"]
 repository = "https://github.com/mozilla/geckodriver"
 readme = "README.md"
 license = "MPL-2.0"