Bump sequel from 5.15.0 to 5.16.0

Bumps [sequel](https://github.com/jeremyevans/sequel) from 5.15.0 to 5.16.0.
- [Release notes](https://github.com/jeremyevans/sequel/releases)
- [Changelog](https://github.com/jeremyevans/sequel/blob/master/CHANGELOG)
- [Commits](jeremyevans/sequel@5.15.0...5.16.0)

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

Gemfile.lock

@@ -97,7 +97,7 @@ GEM
     selenium-webdriver (3.141.0)
       childprocess (~> 0.5)
       rubyzip (~> 1.2, >= 1.2.2)
-    sequel (5.15.0)
+    sequel (5.16.0)
     simplecov (0.16.1)
       docile (~> 1.1)
       json (>= 1.8, < 3)