chore(deps): bump rdoc from 6.3.1 to 6.3.4.1

Bumps [rdoc](https://github.com/ruby/rdoc) from 6.3.1 to 6.3.4.1.
- [Release notes](https://github.com/ruby/rdoc/releases)
- [Changelog](https://github.com/ruby/rdoc/blob/master/History.rdoc)
- [Commits](ruby/rdoc@v6.3.1...v6.3.4.1)

---
updated-dependencies:
- dependency-name: rdoc
  dependency-type: direct:production
...

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

Gemfile

@@ -4,7 +4,7 @@ gem "licensee", ">= 9.9.0"
 gem "github-linguist", ">= 7.12.1"
 gem "commonmarker", "~> 0.23.10"
 gem "RedCloth", "~> 4.3"
-gem "rdoc", "6.3.1"
+gem "rdoc", "6.3.4.1"
 gem "org-ruby", "~> 0.9.12"
 gem "creole", "~> 0.5.0"
 gem "wikicloth", "~> 0.8.3"

Gemfile.lock

@@ -44,7 +44,7 @@ GEM
       rubypants (~> 0.2)
     public_suffix (4.0.6)
     racc (1.6.2)
-    rdoc (6.3.1)
+    rdoc (6.3.4.1)
     reverse_markdown (1.4.0)
       nokogiri
     ruby2_keywords (0.0.4)
@@ -79,7 +79,7 @@ DEPENDENCIES
   github-markup (~> 4.0)
   licensee (>= 9.9.0)
   org-ruby (~> 0.9.12)
-  rdoc (= 6.3.1)
+  rdoc (= 6.3.4.1)
   wikicloth (~> 0.8.3)
 
 BUNDLED WITH