Bump dorian-arguments from 0.3.0 to 0.3.1

Bumps dorian-arguments from 0.3.0 to 0.3.1.

---
updated-dependencies:
- dependency-name: dorian-arguments
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Gemfile.lock

@@ -26,7 +26,7 @@ GEM
  concurrent-ruby (1.3.4)
  connection_pool (2.4.1)
  diff-lcs (1.5.1)
- dorian-arguments (0.3.0)
+ dorian-arguments (0.3.1)
  activesupport
  bigdecimal
  dorian-to_struct