add comment to help with opencv installation

.travis.yml

@@ -21,7 +21,6 @@ script:
   - set -o pipefail && xcodebuild test -workspace "$TRAVIS_XCODE_WORKSPACE" -scheme 'OpenCV Tests' | xcpretty -f `xcpretty-travis-formatter`
   - set -o pipefail && xcodebuild test -workspace "$TRAVIS_XCODE_WORKSPACE" -scheme "$TRAVIS_XCODE_SCHEME" -destination 'platform=iOS Simulator,name=iPhone X' | xcpretty -f `xcpretty-travis-formatter`
 after_success:
-  - bundle exec slather coverage -x
   - bash <(curl -s 'https://codecov.io/bash') -Z -J '^PerspectiveTransform$'
 before_deploy:
   - brew update
@@ -36,4 +35,3 @@ deploy:
   file: PerspectiveTransform.framework.zip
   on:
     tags: true
-

Example/OpenCV-OSX-Tests/OpenCVWrapper.mm

@@ -1,3 +1,5 @@
+// OpenCV needs to be installed
+// brew install opencv
 #import <opencv2/opencv.hpp>
 #import "OpenCVWrapper.h"