update to gradle 6.6.1, jackson 2.11.4

.travis.yml

@@ -1,4 +0,0 @@
-language: java
-jdk:
-  - openjdk11
-

build.gradle

@@ -29,6 +29,7 @@ subprojects {
     apply from: rootProject.file('gradle/compile/java.gradle')
     apply from: rootProject.file('gradle/test/junit5.gradle')
     apply from: rootProject.file('gradle/documentation/asciidoc.gradle')
-    apply from: rootProject.file('gradle/publish/publication.gradle')
+    apply from: rootProject.file('gradle/publish/maven.gradle')
+    apply from: rootProject.file('gradle/publish/ivy.gradle')
 }
 apply from: rootProject.file('gradle/publish/sonatype.gradle')

gradle.properties

@@ -3,5 +3,5 @@ name = net
 version = 2.1.1
 
 gradle.wrapper.version = 6.6.1
-jackson.version = 2.9.10
+jackson.version = 2.11.4
 asciidoclet.version = 1.5.6

gradle/publish/ivy.gradle

@@ -0,0 +1,27 @@
+apply plugin: 'ivy-publish'
+
+publishing {
+    repositories {
+        ivy {
+            url = "https://xbib.org/repo"
+        }
+    }
+    publications {
+        ivy(IvyPublication) {
+            from components.java
+            descriptor {
+                license {
+                    name = 'The Apache License, Version 2.0'
+                    url = 'http://www.apache.org/licenses/LICENSE-2.0.txt'
+                }
+                author {
+                    name = 'Jörg Prante'
+                    url = 'http://example.com/users/jane'
+                }
+                descriptor.description {
+                    text = rootProject.ext.description
+                }
+            }
+        }
+    }
+}