Require Java 16

pom.xml

@@ -2,7 +2,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.gmail.nossr50.mcMMO</groupId>
     <artifactId>mcMMO</artifactId>
-    <version>2.1.202</version>
+    <version>2.1.203-SNAPSHOT</version>
     <name>mcMMO</name>
     <url>https://github.com/mcMMO-Dev/mcMMO</url>
     <scm>
@@ -14,6 +14,9 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <maven.compiler.source>16</maven.compiler.source>
+        <maven.compiler.target>16</maven.compiler.target>
+        <java.version>16</java.version>
     </properties>
 
     <issueManagement>
@@ -99,11 +102,10 @@
                 <artifactId>maven-compiler-plugin</artifactId>
                 <version>3.8.1</version>
                 <configuration>
+                    <release>16</release>
                     <compilerArgs>
                         <arg>-parameters</arg> <!-- used for ACF syntax stuff -->
                     </compilerArgs>
-                    <source>1.8</source>
-                    <target>1.8</target>
                     <excludes>
                     </excludes>
                 </configuration>
@@ -128,7 +130,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-shade-plugin</artifactId>
-                <version>3.2.3</version>
+                <version>3.3.0-SNAPSHOT</version>
                 <configuration>
                     <artifactSet>
                         <includes>
@@ -207,6 +209,13 @@
             </extension>
         </extensions>
     </build>
+    <pluginRepositories>
+        <pluginRepository>
+            <id>maven-snapshots</id>
+            <url>https://repository.apache.org/content/repositories/snapshots/</url>
+        </pluginRepository>
+    </pluginRepositories>
+
     <repositories>
         <repository>
             <id>spigot-repo</id>