Adding possibility to change pagination message by config file

Default message can by overriten by "paginator_message" parameter in _config.yml

docs/advanced-usage.md

@@ -138,3 +138,12 @@ Which will generate following canonical_url:
 ```html
 <link rel="canonical" href="http://yoursite.com/title-of-your-post" />
 ```
+
+### Changing title message for paginated page
+
+You can override default title message for paginated page from `Page %<current>s of %<total>s for ` to custom message by adding parameter to `_config.yml`.  
+For example:  
+```yml
+paginator_message: "%<current>s / %<total>s |"
+```
+For key **paginator_message** please use string template with two variables `current` and `total`.

jekyll-seo-tag.gemspec

@@ -29,7 +29,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
 
   spec.add_dependency "jekyll", "~> 3.3"
-  spec.add_development_dependency "bundler", "~> 1.15"
+  spec.add_development_dependency "bundler"
   spec.add_development_dependency "html-proofer", "~> 3.7"
   spec.add_development_dependency "rspec", "~> 3.5"
   spec.add_development_dependency "rubocop-jekyll", "~> 0.4"

lib/jekyll-seo-tag/drop.rb

@@ -189,8 +189,9 @@ module Jekyll
 
         current = @context["paginator"]["page"]
         total = @context["paginator"]["total_pages"]
+        paginator_message = site["paginator_message"] || "Page %<current>s of %<total>s for "
 
-        return "Page #{current} of #{total} for " if current > 1
+        format(paginator_message, :current => current, :total => total) if current > 1
       end
 
       attr_reader :context

spec/jekyll_seo_tag/drop_spec.rb

@@ -482,6 +482,27 @@ RSpec.describe Jekyll::SeoTag::Drop do
     end
   end
 
+  context "pagination" do
+    let(:context) do
+      make_context(
+        { :page => page, :site => site },
+        "paginator" => { "page" => 2, "total_pages" => 10 }
+      )
+    end
+
+    it "render default pagination title" do
+      expect(subject.send(:page_number)).to eq("Page 2 of 10 for ")
+    end
+
+    context "render custom pagination title" do
+      let(:config) { { "paginator_message" => "%<current>s of %<total>s" } }
+
+      it "renders the correct page number" do
+        expect(subject.send(:page_number)).to eq("2 of 10")
+      end
+    end
+  end
+
   it "exposes the JSON-LD drop" do
     expect(subject.json_ld).to be_a(Jekyll::SeoTag::JSONLDDrop)
   end

spec/spec_helper.rb

@@ -4,6 +4,7 @@ $LOAD_PATH.unshift File.expand_path("../lib", __dir__)
 require "jekyll"
 require "jekyll-seo-tag"
 require "html-proofer"
+require "jekyll-paginate"
 
 # Monkey patch Jekyll::Drops::Drop so Rspec's `have_key` works as expected
 module Jekyll