Error on running ios example

[vietstone-ng]

When I tried to run the example on iOS Simulator, I encountered the error as the screenshot.
After some research, I can fix with 2 steps below:

• in Podfile, uncomment line 2 (remove the # character, means force build for ios 9 instead of default ios 8)
  platform :ios, '9.0'
• run pod install in ios folder

Although I can fix it with these 2 steps, I think this's not the correct change to make a new PR (especially pod install). Maybe some changes from Flutter configuration is the right solution.

<Error screenshot>

[NikitaAmelinCR]

Hi @vietstone-ng! Sorry for delay. It has been fixed in #22. Thanks!