Remove obsolete travis file

.travis.yml

@@ -1,31 +0,0 @@
-jobs:
-  include:
-    - language: node_js
-      node_js:
-        - "10"
-      env:
-        - CXX=g++-4.8
-      addons:
-        apt:
-          sources:
-            - ubuntu-toolchain-r-test
-          packages:
-            - g++-4.8
-      before_install:
-        - sudo apt-get update -qq
-        - sudo apt-get install -qq libcairo2-dev libjpeg8-dev libpango1.0-dev libgif-dev build-essential g++
-        - sudo apt-get install -qq xvfb libgles2-mesa-dev libgbm-dev libxxf86vm-dev
-      install:
-        - npm install
-        - wget -O test_data.zip https://github.com/maptiler/tileserver-gl/releases/download/v1.3.0/test_data.zip
-        - unzip -q test_data.zip -d test_data
-      script:
-        - xvfb-run --server-args="-screen 0 1024x768x24" npm test
-    - language: ruby
-      services:
-        - docker
-      before_install:
-        - docker build -t kombinat451/tileserver-gl .
-      script:
-        - echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin
-        - docker push kombinat451/tileserver-gl