Cleanup README.md and align with v4.5.5

Author: derjust

README.md

@@ -56,20 +56,6 @@ Download the JAR though [Maven Central](http://mvnrepository.com/artifact/com.gi
 </dependency>
 ```
 
-or via Gradle
-
-```yml
-repositories {
-  mavenCentral()
-}
-
-dependencies {
-  compile group: 'com.github.spring-data-dynamodb',
-  name: 'spring-data-dynamodb',
-  version: '5.0.1'
-}
-```
-
 Setup DynamoDB configuration as well as enabling Spring Data DynamoDB repository support.
 
 ```java

src/changes/changes.xml

@@ -88,7 +88,7 @@
         Added Spring 5 / Spring-Data Kay support
       </action>
     </release>
-    <release version="4.5.5" date="" description="Backport of v5.0 (master)">
+    <release version="4.5.5" date="2018-03-07" description="Backport of v5.0 (master)">
       <action dev="derjust" type="fix" issue="139">
         Backport of v5.0 branch (master)
       </action>