add version check and notify user

pom.xml

@@ -112,6 +112,10 @@
             <id>placeholderapi</id>
             <url>https://repo.extendedclip.com/content/repositories/placeholderapi/</url>
         </repository>
+        <repository>
+            <id>viaversion-repo</id>
+            <url>https://repo.viaversion.com</url>
+        </repository>
     </repositories>
 
     <dependencies>
@@ -160,6 +164,13 @@
             <version>7.0.0</version>
             <scope>compile</scope>
         </dependency>
+
+        <dependency>
+            <groupId>com.viaversion</groupId>
+            <artifactId>viaversion-api</artifactId>
+            <version>4.9.2</version>
+            <scope>provided</scope>
+        </dependency>
     </dependencies>
 
 </project>