Bump selenium-webdriver from 3.12.0 to 3.13.0

Bumps [selenium-webdriver](https://github.com/SeleniumHQ/selenium) from 3.12.0 to 3.13.0.
- [Release notes](https://github.com/SeleniumHQ/selenium/releases)
- [Changelog](https://github.com/SeleniumHQ/selenium/blob/master/rb/CHANGES)
- [Commits](SeleniumHQ/selenium@selenium-3.12.0...selenium-3.13.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Gemfile.lock

@@ -31,7 +31,7 @@ GEM
     faraday (0.15.1)
       multipart-post (>= 1.2, < 3)
     fastimage (2.1.3)
-    ffi (1.9.23)
+    ffi (1.9.25)
     hikidoc (0.1.0)
     jasmine (2.99.0)
       jasmine-core (>= 2.99.0, < 3.0.0)
@@ -89,7 +89,7 @@ GEM
     sawyer (0.8.1)
       addressable (>= 2.3.5, < 2.6)
       faraday (~> 0.8, < 1.0)
-    selenium-webdriver (3.12.0)
+    selenium-webdriver (3.13.0)
       childprocess (~> 0.5)
       rubyzip (~> 1.2)
     sequel (5.9.0)