Synchronous access to currentLogFileHandle.

[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
  --> Instead, I tested several times manually at local machine.

• 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)

This merge request fixes / refers to the following issues: #945

Pull Request Description

I added synchronous access to currentLogFileHandle.

[codecov-io]

Codecov Report

Merging #946 into master will decrease coverage by 0.08%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #946      +/-   ##
==========================================
- Coverage   22.31%   22.22%   -0.09%     
==========================================
  Files          17       17              
  Lines        2631     2641      +10     
==========================================
  Hits          587      587              
- Misses       2044     2054      +10

Impacted Files	Coverage Δ
Classes/DDFileLogger.m	0% <0%> (ø)	⬆️

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[bpoplauschi]

Thanks @sushichop