Update nokogiri dependency.

Author: gkellogg

Gemfile

@@ -1,5 +1,5 @@
 source "https://rubygems.org"
-gem "nokogiri",       '~> 1.10'
+gem "nokogiri",       '~> 1.13', '>= 1.13.4'
 
 gemspec
 gem 'rdf',                  git: "https://github.com/ruby-rdf/rdf",                 branch: "develop"

example-files/afs_prefix_flag.jsonld

@@ -0,0 +1,11 @@
+{
+  "@id" : "http://example/collection",
+  "http://example/p" : [ "book:ZZZ" ],
+  "book" : [ "book:YYY" ],
+  "@context" : {
+    "book" : {
+      "@id" : "http://onbetween.ch/3ms/cms#",
+      "@type" : "@id"
+    }
+  }
+}