Bump simplecov-cobertura from 2.1.0 to 3.0.0

Bumps [simplecov-cobertura](https://github.com/jessebs/simplecov-cobertura) from 2.1.0 to 3.0.0.
- [Release notes](https://github.com/jessebs/simplecov-cobertura/releases)
- [Commits](jessebs/simplecov-cobertura@v2.1.0...v3.0.0)

---
updated-dependencies:
- dependency-name: simplecov-cobertura
  dependency-version: 3.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -26,7 +26,7 @@ GEM
     curb (1.0.9)
     diff-lcs (1.5.1)
     diffy (3.4.2)
-    docile (1.4.0)
+    docile (1.4.1)
     domain_name (0.5.20190701)
       unf (>= 0.0.5, < 1.0.0)
     em-http-request (1.1.7)
@@ -154,10 +154,10 @@ GEM
       docile (~> 1.1)
       simplecov-html (~> 0.11)
       simplecov_json_formatter (~> 0.1)
-    simplecov-cobertura (2.1.0)
+    simplecov-cobertura (3.0.0)
       rexml
       simplecov (~> 0.19)
-    simplecov-html (0.12.3)
+    simplecov-html (0.13.1)
     simplecov-json (0.2.3)
       json
       simplecov