Adds IDEWorkspaceChecks.plist

[sushichop]

New Pull Request Checklist

• I have read and understood the CONTRIBUTING guide

• I have read the Documentation

• I have searched for a similar pull request in the project and found none

• I have updated this branch with the latest master to avoid conflicts (via merge from master or rebase)

• I have added the required tests to prove the fix/feature I am adding

• I have updated the documentation (if necessary)

• I have run the tests and they pass

• I have run the lint and it passes (pod lib lint)

Adds IDEWorkspaceChecks.plist that is created by Xcode 9.3.
According to Xcode 9.3 Release Notes, developers should commit this file after Xcode 9.3.

Xcode 9.3 adds a new IDEWorkspaceChecks.plist file to a workspace's shared data, to store the state of necessary workspace checks. Committing this file to source control will prevent unnecessary rerunning of those checks for each user opening the workspace. (37293167)

[codecov-io]

Codecov Report

Merging #923 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #923   +/-   ##
=======================================
  Coverage   21.56%   21.56%           
=======================================
  Files          14       14           
  Lines        3358     3358           
  Branches       43       43           
=======================================
  Hits          724      724           
  Misses       2628     2628           
  Partials        6        6

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