Drop Travis

[Skip CI]
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index a463353..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,34 +0,0 @@
-# Licensed to the Apache Software Foundation (ASF) under one or more
-# contributor license agreements.  See the NOTICE file distributed with
-# this work for additional information regarding copyright ownership.
-# The ASF licenses this file to You under the Apache License, Version 2.0
-# (the "License"); you may not use this file except in compliance with
-# the License.  You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-language: java
-cache:
-  directories:
-    - $HOME/.m2
-jdk:
-  - openjdk8
-  - openjdk11
-  - openjdk14
-
-# The default build is so verbose the travis log file can exceed the allowed limit.
-# Run a custom install that hides all the Maven ‘Downloading’ messages.
-install:
-  - mvn install -Dmaven.javadoc.skip=true -V -B -Dorg.slf4j.simpleLogger.log.org.apache.maven.cli.transfer.Slf4jMavenTransferListener=warn
-
-script:
-  - mvn
-
-after_success:
-  - mvn jacoco:report coveralls:report