Merge pull request #2428 from alphagov/dependabot/bundler/pdf-reader-2.15.1

Author: govuk-ci

Gemfile.lock

@@ -493,7 +493,7 @@ GEM
     parser (3.3.9.0)
       ast (~> 2.4.1)
       racc
-    pdf-reader (2.15.0)
+    pdf-reader (2.15.1)
       Ascii85 (>= 1.0, < 3.0, != 2.0.0)
       afm (>= 0.2.1, < 2)
       hashery (~> 2.0)