Bump to Gradle 4.9, fix deprecation warnings.

build.gradle

@@ -40,6 +40,14 @@ dependencies {
     testCompile "org.junit.jupiter:junit-jupiter-engine:${junitVersion}"
 }
 
+compileJava {
+    options.compilerArgs += ['-proc:none']
+}
+
+compileTestJava {
+    options.compilerArgs += ['-proc:none']
+}
+
 jar {
     manifest {
         attributes 'Main-Class': 'com.velocitypowered.proxy.Velocity'
@@ -47,6 +55,12 @@ jar {
     }
 }
 
+test {
+    reports {
+        junitXml.enabled = true
+    }
+}
+
 task javadocJar(type: Jar) {
     classifier 'javadoc'
     from javadoc

gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.9-all.zip