Bump bstats-bukkit from 1.8 to 2.1.0

Bumps [bstats-bukkit](https://github.com/Bastian/bStats-Metrics) from 1.8 to 2.1.0.
- [Release notes](https://github.com/Bastian/bStats-Metrics/releases)
- [Commits](https://github.com/Bastian/bStats-Metrics/commits/v2.1.0)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

pom.xml

@@ -79,7 +79,7 @@
         <dependency>
             <groupId>org.bstats</groupId>
             <artifactId>bstats-bukkit</artifactId>
-            <version>1.8</version>
+            <version>2.1.0</version>
             <scope>compile</scope>
         </dependency>
     </dependencies>