Bump addressable from 2.8.0 to 2.9.0 (#25)

Author: dependabot[bot]

Gemfile.lock

@@ -2,8 +2,8 @@ GEM
   remote: https://rubygems.org/
   specs:
     Ascii85 (1.1.0)
-    addressable (2.8.0)
-      public_suffix (>= 2.0.2, < 5.0)
+    addressable (2.9.0)
+      public_suffix (>= 2.0.2, < 8.0)
     afm (0.2.2)
     asciidoctor (2.0.11)
     asciidoctor-pdf (1.6.2)
@@ -46,7 +46,7 @@ GEM
     prawn-templates (0.1.2)
       pdf-reader (~> 2.0)
       prawn (~> 2.2)
-    public_suffix (4.0.6)
+    public_suffix (7.0.5)
     rake (13.0.6)
     rexml (3.3.9)
     ruby-rc4 (0.1.5)