Bump rdoc from 6.15.1 to 6.16.1 (#596)

Author: dependabot[bot]

Gemfile.lock

@@ -76,7 +76,7 @@ GEM
     racc (1.8.1)
     rainbow (3.1.1)
     rake (13.3.1)
-    rdoc (6.15.1)
+    rdoc (6.16.1)
       erb
       psych (>= 4.0.0)
       tsort
@@ -208,7 +208,7 @@ CHECKSUMS
   racc (1.8.1) sha256=4a7f6929691dbec8b5209a0b373bc2614882b55fc5d2e447a21aaa691303d62f
   rainbow (3.1.1) sha256=039491aa3a89f42efa1d6dec2fc4e62ede96eb6acd95e52f1ad581182b79bc6a
   rake (13.3.1) sha256=8c9e89d09f66a26a01264e7e3480ec0607f0c497a861ef16063604b1b08eb19c
-  rdoc (6.15.1) sha256=28bfac73cd8b226a8079f53a564ceaccdb5b4480e34335100001570ddb1a481a
+  rdoc (6.16.1) sha256=71357cc208e6da77ba0c4494e01ae870dd18b437c7c7d801dd73ee2f340b9f5c
   regexp_parser (2.11.3) sha256=ca13f381a173b7a93450e53459075c9b76a10433caadcb2f1180f2c741fc55a4
   reline (0.6.3) sha256=1198b04973565b36ec0f11542ab3f5cfeeec34823f4e54cebde90968092b1835
   rexml (3.4.4) sha256=19e0a2c3425dfbf2d4fc1189747bdb2f849b6c5e74180401b15734bc97b5d142