docs: readme version update (#278)

* docs: readme version update

* chore: version update

Author: nicklasl

README.md

@@ -15,7 +15,7 @@ Add the OpenFeature provider dependency if you want to use Confidence via the Op
 <dependency>
     <groupId>com.spotify.confidence</groupId>
     <artifactId>openfeature-provider</artifactId>
-    <version>0.2.8</version>
+    <version>0.5.0</version>
 </dependency>
 ```
 <!---x-release-please-end-->
@@ -138,4 +138,4 @@ To opt out of this behavior, you can disable telemetry by setting the `disableTe
 final Confidence confidence = Confidence.Builder("<CLIENT_SECRET>")
         .disableTelemetry(true)
         .build();
-```
+```