Setting up Travis for React Native

Copy 
1- name: "iOS App Build and Deploy to iTunesConnect"
2  language: objective-c
3  os: osx
4  osx_image: xcode10.2
5  node_js:
6    - "8"
7  before_install:
8    - brew update
9    - brew install watchman
10    - travis_retry npm install -g yarn
11    - travis_retry npm install -g react-native-cli
12    - gem install fastlane --version 2.112.0 --no-document --quiet

Copy 
1- name: "Android App Build and Deploy to Google Play"
2  language: android
3  components:
4    - platform-tools
5    - tools
6    - extra-android-m2repository
7    - extra-google-google_play_services
8    - extra-google-m2repository
9    - add-on
10    - extra
11  licenses:
12    - android-sdk-preview-license-.+
13    - android-sdk-license-.+
14    - google-gdk-license-.+
15  before_install:
16    - nvm install 8
17    - travis_retry npm install -g yarn
18    - travis_retry npm install -g react-native-cli
19    - gem install fastlane --version 2.112.0 --no-document --quiet
20    - touch $HOME/.android/repositories.cfg
21    - yes | sdkmanager "platforms;android-27"
22    - yes | sdkmanager "build-tools;27.0.3"
23    - sudo apt-get install automake autoconf python-dev build-essential
24    - git clone https://github.com/facebook/watchman.git
25    - cd watchman
26    - git checkout v4.9.0
27    - ./autogen.sh
28    - ./configure
29    - make
30    - sudo make install
31    - cd ..
32    - echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p