[GitHub] [cordova-ios] raphinesse opened a new pull request #712: Update Xcode versions used in CI to latest minor release

[GitBox <gi...@apache.org>]

raphinesse opened a new pull request #712: Update Xcode versions used in CI to latest minor release
URL: https://github.com/apache/cordova-ios/pull/712
 
 
   ### Motivation and Context
   <!-- Why is this change required? What problem does it solve? -->
   <!-- If it fixes an open issue, please link to the issue here. -->
   Lately the ObjC tests that were using Xcode 10.1 on CI have been very unstable. It was not uncommon that two out of four CI runs failed. [The Error](https://travis-ci.org/apache/cordova-ios/jobs/604550483#L2258-L2260) is always the same and seems to be caused by a [known defect](https://github.com/microsoft/azure-pipelines-tasks/issues/8840) in Xcode 10.1. The only known fix seems to be not to use 10.1. So that's what we will do.
   
   
   ### Description
   <!-- Describe your changes in detail -->
   I've updated our Travis CI config to use Xcode 9.4 and 10.3 respectively. The update of Xcode 9 is not necessary, but since it's the current default for Travis CI ObjC images I thought it wouldn't hurt.
   
   
   ### Testing
   I've let the five CI jobs run four times each on my fork's CI with these changes and there were no errors.

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