fix: remove travis cause CT workflow

Signed-off-by: Vinayak Kulkarni <19776877+vinayakkulkarni@users.noreply.github.com>

.travis.yml

@@ -1,21 +0,0 @@
-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