Bump simplecov from 0.15.1 to 0.16.1

Bumps [simplecov](https://github.com/colszowka/simplecov) from 0.15.1 to 0.16.1.
- [Release notes](https://github.com/colszowka/simplecov/releases)
- [Changelog](https://github.com/colszowka/simplecov/blob/master/CHANGELOG.md)
- [Commits](simplecov-ruby/simplecov@v0.15.1...v0.16.1)

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

Gemfile.lock

@@ -91,7 +91,7 @@ GEM
     cucumber-wire (0.0.1)
     debug_inspector (0.0.3)
     diff-lcs (1.3)
-    docile (1.1.5)
+    docile (1.3.0)
     domain_name (0.5.20170404)
       unf (>= 0.0.5, < 1.0.0)
     erubi (1.7.1)
@@ -291,8 +291,8 @@ GEM
       sass (~> 3.5.5)
     sentry-raven (2.7.2)
       faraday (>= 0.7.6, < 1.0)
-    simplecov (0.15.1)
-      docile (~> 1.1.0)
+    simplecov (0.16.1)
+      docile (~> 1.1)
       json (>= 1.8, < 3)
       simplecov-html (~> 0.10.0)
     simplecov-html (0.10.2)