chore: Updated node to version 12 on travis (#169)

Author: avishayil

.travis.yml

@@ -12,7 +12,7 @@ android:
     - extra-google-m2repository
 
 before_install:
-  - nvm install 10
+  - nvm install 12
   - node --version
   - curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
   - echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list