Changed from old "compile" to new "implementation"

Worked successfully with Gradle 6.8.1 and JDK11

Author: BruceEckel

gradle/java.gradle

@@ -18,7 +18,7 @@ sourceSets {
             include '*.xml'
         }
     }
-    
+
     test {
         java {
             srcDir file("tests")
@@ -32,8 +32,8 @@ repositories {
 
 dependencies {
     // Logging:
-    compile 'org.slf4j:slf4j-api:1.7.21'
-    compile 'ch.qos.logback:logback-classic:1.1.7'
+    implementation 'org.slf4j:slf4j-api:1.7.21'
+    implementation 'ch.qos.logback:logback-classic:1.1.7'
     // You can also use the JDK's built-in logging as the back end:
     // compile group: 'org.slf4j:slf4j-jdk14:1.7.21'
-}
+}