Update snapshot directory to central portal

Author: acogoluegnes

README.adoc

@@ -111,15 +111,15 @@ repositories {
 </dependency>
 ----
 
-Snapshots are available on the Sonatype OSS snapshot repository:
+Snapshots are available on the central portal snapshot repository:
 
 .pom.xml
 [source,xml,subs="attributes,specialcharacters"]
 ----
 <repositories>
   <repository>
     <id>ossrh</id>
-    <url>https://oss.sonatype.org/content/repositories/snapshots</url>
+    <url>https://central.sonatype.com/repository/maven-snapshots/</url>
     <snapshots>
       <enabled>true</enabled>
     </snapshots>