Add version info

app/views/shared/_footer.html.slim

 footer.text-center
-  p powered by <a href="https://gitlab.com/mbajur/prismo"><span>△</span> Prismo</a>
+  p powered by <a href="https://gitlab.com/mbajur/prismo"><span>△</span> Prismo</a> #{Prismo::Version}

config/application.rb

@@ -16,6 +16,8 @@ require "sprockets/railtie"
 # you've limited to :test, :development, or :production.
 Bundler.require(*Rails.groups)
 
+require_relative '../lib/prismo/version'
+
 module Prismo
   class Application < Rails::Application
     port     = ENV.fetch('PORT') { 3000 }

lib/prismo/version.rb

+module Prismo
+  module Version
+    module_function
+
+    def major
+      0
+    end
+
+    def minor
+      0
+    end
+
+    def patch
+      1
+    end
+
+    def pre
+      nil
+    end
+
+    def flags
+      nil
+    end
+
+    def to_a
+      [major, minor, patch, pre].compact
+    end
+
+    def to_s
+      [to_a.join('.'), flags].join
+    end
+  end
+end