[GEARPUMP-302] Fix 'latest release' label

The link is generated automatically only partly - the visible part is ok, but the link leads to hardcoded version. This PR fixes url generation.

Author: karol brejna <karol.brejna@intel.com>

Closes #15 from karol-brejna-i/GEARPUMP-302.
diff --git a/content/overview.html b/content/overview.html
index 6504903..ca717f4 100644
--- a/content/overview.html
+++ b/content/overview.html
@@ -98,7 +98,7 @@
    
 
    <p><img src="/favicon.ico" alt="gearpump-logo" /> 
-<a href="https://dist.apache.org/repos/dist/release/incubator/gearpump/0.8.2-incubating/"><img src="https://img.shields.io/badge/Latest%20Release-v0.8.3-blue.svg" alt="Release" /></a></p>
+<a href="https://dist.apache.org/repos/dist/release/incubator/gearpump/0.8.3-incubating/"><img src="https://img.shields.io/badge/Latest%20Release-v0.8.3-blue.svg" alt="Release" /></a></p>
 
 <p><strong>Apache Gearpump</strong> is a real-time big data streaming engine. The name Gearpump is a reference to the engineering term &#8220;gear pump&#8221; which is a super simple pump that consists of only two gears, but is very powerful at streaming water. Different to other streaming engines, Gearpump&#8217;s engine is event/message based. Per initial benchmarks we are able to process 18 million messages per second (message length is 100 bytes) with a 8ms latency on a 4-node cluster.</p>
 
diff --git a/overview.md b/overview.md
index f3c141d..72512f8 100644
--- a/overview.md
+++ b/overview.md
@@ -6,7 +6,7 @@
 ---
 
 ![gearpump-logo](/favicon.ico) 
-[![Release](https://img.shields.io/badge/Latest%20Release-v{{ site.GEARPUMP_VERSION }}-blue.svg)](https://dist.apache.org/repos/dist/release/incubator/gearpump/0.8.2-incubating/)
+[![Release](https://img.shields.io/badge/Latest%20Release-v{{ site.GEARPUMP_VERSION }}-blue.svg)](https://dist.apache.org/repos/dist/release/incubator/gearpump/{{ site.GEARPUMP_VERSION }}-incubating/)
 
 **Apache Gearpump** is a real-time big data streaming engine. The name Gearpump is a reference to the engineering term "gear pump" which is a super simple pump that consists of only two gears, but is very powerful at streaming water. Different to other streaming engines, Gearpump's engine is event/message based. Per initial benchmarks we are able to process 18 million messages per second (message length is 100 bytes) with a 8ms latency on a 4-node cluster.