Add info messages for release 1.0.0 tasks

So users know what's going on when they upgrade CONSUL.

lib/application_logger.rb

@@ -0,0 +1,11 @@
+class ApplicationLogger
+  def info(message)
+    logger.info(message)
+  end
+
+  def logger
+    @logger ||= Logger.new(STDOUT).tap do |logger|
+      logger.formatter = proc { |severity, _datetime, _progname, msg| "#{severity} #{msg}\n" }
+    end
+  end
+end