Restore Apache Geode graphic (#15)

diff --git a/README.md b/README.md
index d44c8c2..620b478 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@
 limitations under the License.
 -->
 
-[<img src="https://geode.apache.org/img/apache_geode_logo.png" align="center"/>](http://geode.apache.org)
+[<img src="https://geode.apache.org/img/Apache_Geode_logo.png" align="center"/>](http://geode.apache.org)
 
 [![Build Status](https://travis-ci.org/apache/geode-site.svg?branch=master)](https://travis-ci.org/apache/geode-site) [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://www.apache.org/licenses/LICENSE-2.0)