Bump simplecov-rcov from 0.3.5 to 0.3.7

Bumps [simplecov-rcov](https://github.com/fguillen/simplecov-rcov) from 0.3.5 to 0.3.7.
- [Commits](fguillen/simplecov-rcov@v0.3.5...v0.3.7)

---
updated-dependencies:
- dependency-name: simplecov-rcov
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Gemfile.lock

@@ -695,7 +695,7 @@ GEM
       simplecov-html (~> 0.11)
       simplecov_json_formatter (~> 0.1)
     simplecov-html (0.12.3)
-    simplecov-rcov (0.3.5)
+    simplecov-rcov (0.3.7)
       simplecov (>= 0.4.1)
     simplecov_json_formatter (0.1.4)
     slimmer (18.3.0)