Remove TravisCI (#4403)

.travis.yml

@@ -1,33 +0,0 @@
-sudo: required
-dist: trusty
-
-language: java
-jdk:
-  - oraclejdk8
-  - openjdk8
-
-before_cache:
-  - rm -f $HOME/.gradle/caches/modules-2/modules-2.lock
-  - rm -fr $HOME/.gradle/caches/*/plugin-resolution/
-  - rm -f $HOME/.gradle/caches/minecraft/ForgeVersion.json
-  - rm -f $HOME/.gradle/caches/minecraft/ForgeVersion.json.etag
-  - rm -fr $HOME/.gradle/caches/minecraft/deobfedDeps
-  - rm -f $HOME/.gradle/caches/*/fileHashes/fileHashes.bin
-  - rm -f $HOME/.gradle/caches/*/fileHashes/fileHashes.lock
-
-cache:
-  directories:
-    - '$HOME/.m2/repository'
-    - '$HOME/.sonar/cache'
-    - '$HOME/.gradle/wrapper'
-    - '$HOME/.gradle/caches'
-
-addons:
-  sonarcloud:
-    organization: "appliedenergistics"
-
-install: "./gradlew setupCIWorkspace"
-script: 
-  - "./gradlew build"
-  - "./gradlew test"
-  - "./gradlew sonarqube"