Restore correct behavior of AwsS3CloudFrontAdapter, which was never invalidating anything

[fquffio]

Resolves #7, among other issues introduced with #6 that caused AwsS3CloudFrontAdapter to never invalidate anything from the CloudFront distribution.

[codecov]

Codecov Report

Merging #8 (9315ece) into master (fc507cb) will increase coverage by 4.53%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master       #8      +/-   ##
============================================
+ Coverage     93.25%   97.79%   +4.53%     
- Complexity       66       67       +1     
============================================
  Files             7        7              
  Lines           178      181       +3     
============================================
+ Hits            166      177      +11     
+ Misses           12        4       -8     

Impacted Files	Coverage Δ
src/Filesystem/Adapter/S3Adapter.php	100.00% <ø> (ø)
src/Filesystem/Adapter/AwsS3CloudFrontAdapter.php	93.33% <100.00%> (+20.16%)	⬆️
src/Mailer/Transport/SesTransport.php	100.00% <100.00%> (ø)
src/Mailer/Transport/SnsTransport.php	100.00% <100.00%> (ø)
src/Plugin.php	100.00% <100.00%> (ø)

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