Update url of schema website (#296)

Merge pull request 296

lib/jekyll-seo-tag/json_ld_drop.rb

@@ -28,7 +28,7 @@ module Jekyll
 
       def fallback_data
         {
-          "@context" => "http://schema.org",
+          "@context" => "https://schema.org",
         }
       end
 

spec/jekyll_seo_tag/json_ld_drop_spec.rb

@@ -35,7 +35,7 @@ RSpec.describe Jekyll::SeoTag::JSONLDDrop do
 
   it "returns the context" do
     expect(subject).to have_key("@context")
-    expect(subject["@context"]).to eql("http://schema.org")
+    expect(subject["@context"]).to eql("https://schema.org")
   end
 
   it "returns the type" do