Delete .travis.yml

Removing Travis CI as ASF Infra has decided to move away from Travis.
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index d7f187e..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,33 +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
-sudo: false
-jdk:
-- openjdk8
-install: true
-script: "./travis.sh"
-env:
-  global:
-    - BUILD_SNAPSHOTS_BRANCH=develop
-    - ARTIFACTORY_URL=https://mifos.jfrog.io/mifos
-    - ARTIFACTORY_USER=travis-ci
-    - secure: "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"
-after_failure:
-  - ./gradlew rat
-  - cat api/build/reports/rat/rat-report.txt