update Druid links (#684)

http to https
link to druid.apache.org

README.md

@@ -3,7 +3,7 @@
 [![npm version](https://img.shields.io/npm/v/turnilo.svg)](https://www.npmjs.org/package/turnilo)
 [![build status](https://travis-ci.org/allegro/turnilo.svg?branch=master)](https://travis-ci.org/allegro/turnilo)
 
-Turnilo is a business intelligence, data exploration and visualization web application for [Druid](http://druid.io/).
+Turnilo is a business intelligence, data exploration and visualization web application for [Apache Druid](https://druid.apache.org).
 Turnilo is a fork of [Pivot](https://github.com/implydata/pivot) which is currently available under commercial licence only.
 This repository was forked from the stalled repository [Swiv](https://github.com/yahoo/swiv) 
 with the latest version of Pivot under Apache license.
@@ -30,9 +30,9 @@ this is how Turnilo emerged.
 
 * Intuitive, drag and drop, gorgeous user interface to visualize Druid datasets
 * Fully dedicated to low latency Druid 
-[Timeseries](http://druid.io/docs/latest/querying/timeseriesquery.html), 
-[TopN](http://druid.io/docs/latest/querying/topnquery.html) and 
-[GroupBy](http://druid.io/docs/latest/querying/groupbyquery.html) queries.
+[Timeseries](https://druid.apache.org/docs/latest/querying/timeseriesquery.html), 
+[TopN](https://druid.apache.org/docs/latest/querying/topnquery.html) and 
+[GroupBy](https://druid.apache.org/docs/latest/querying/groupbyquery.html) queries.
 * Unified view for historical and real-time data
 * Blazingly fast