Bump codecov from 0.2.15 to 0.3.0 (publiclab#9041)

Bumps [codecov](https://github.com/codecov/codecov-ruby) from 0.2.15 to 0.3.0.
- [Release notes](https://github.com/codecov/codecov-ruby/releases)
- [Changelog](https://github.com/codecov/codecov-ruby/blob/master/CHANGELOG.md)
- [Commits](codecov/codecov-ruby@v0.2.15...v0.3.0)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Gemfile.lock

@@ -82,8 +82,8 @@ GEM
       ci_reporter (~> 2.0)
       test-unit (>= 2.5.5, < 4.0)
     climate_control (0.2.0)
-    codecov (0.2.15)
-      simplecov (>= 0.15, < 0.21)
+    codecov (0.3.0)
+      simplecov (>= 0.15, < 0.22)
     coderay (1.1.2)
     coffee-rails (5.0.0)
       coffee-script (>= 2.2.0)
@@ -105,7 +105,7 @@ GEM
     diff-lcs (1.4.4)
     digest-crc (0.6.3)
       rake (>= 12.0.0, < 14.0.0)
-    docile (1.3.4)
+    docile (1.3.5)
     domain_name (0.5.20190701)
       unf (>= 0.0.5, < 1.0.0)
     dry-configurable (0.11.6)