chore: Disable OpenCV download (#2838)

* chore: Disable OpenCV download

* Took out slack integration as well

Author: iamareebjamal

.travis.yml

@@ -67,7 +67,6 @@ licenses:
   - 'google-gdk-license-.+'
 
 before_script:
-  - ./scripts/download_open_cv.sh
   - echo "Starting AVD"
   - echo no | android create avd --force -n test -t android-22 --abi armeabi-v7a
   - emulator -avd test -no-audio -no-window &
@@ -77,13 +76,9 @@ before_script:
 
 script:
   - ./gradlew spotlessCheck
-  - ./scripts/copy_opencv.sh
   - ./gradlew build
   - ./gradlew build connectedAndroidTest jacocoTestReport --stacktrace
 
 after_success:
   - bash <(curl -s https://codecov.io/bash)
   - bash scripts/update-apk.sh
-
-notifications:
-  slack: fossasia:JgzycrBUs0nKnmJhsAxCB4bL