Remove travis.

.travis.yml

@@ -1,23 +0,0 @@
-language: java
-sudo: false
-addons:
-    sonarcloud:
-        organization: "bentobox-world"
-
-jdk:
-    - openjdk8
-    - openjdk11
-    
-matrix:
-  allow_failures:
-    - jdk: openjdk11
-        
-script:
-    - mvn clean org.jacoco:jacoco-maven-plugin:prepare-agent install
-    - wget https://github.com/sormuras/bach/raw/master/install-jdk.sh && . ./install-jdk.sh -F 11 -L GPL
-    - mvn sonar:sonar -Dsonar.projectKey=BentoBoxWorld_BentoBox
-
-cache:
-    directories:
-        - '$HOME/.m2/repository'
-        - '$HOME/.sonar/cache'