removed bstats-repo

removed bstats repo as its already shaded and prevented the plugin from compiling  (it will compile now)

this one im not 100% sure about as there was no example to follow in slimefun pom.yml but i think i did it right

pom.xml

@@ -35,10 +35,6 @@
             <id>jitpack.io</id>
             <url>https://jitpack.io</url>
         </repository>
-        <repository>
-            <id>bstats-repo</id>
-            <url>https://repo.codemc.org/repository/maven-public</url>
-        </repository>
     </repositories>
 
     <build>
@@ -72,22 +68,27 @@
         </resources>
 
         <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.5.1</version>
+                <configuration>
+                    <source>16</source>
+                    <target>16</target>
+                </configuration>
+            </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-shade-plugin</artifactId>
-                <version>3.2.4</version>
-
+                <version>3.3.0</version>
                 <configuration>
-
-                    <!-- Shade dependencies into the output jar -->
                     <relocations>
                         <relocation>
                             <pattern>org.bstats</pattern>
                             <shadedPattern>io.github.thebusybiscuit.exoticgarden.bstats</shadedPattern>
                         </relocation>
                     </relocations>
 
-                    <!-- Exclude unneeded metadata files from shaded dependencies -->
                     <filters>
                         <filter>
                             <artifact>*:*</artifact>
@@ -96,8 +97,8 @@
                             </excludes>
                         </filter>
                     </filters>
-                </configuration>
 
+                </configuration>
                 <executions>
                     <execution>
                         <phase>package</phase>