Allowing version 6 and 7 of symfony/yaml

[jaydiablo]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 69.87%. Comparing base (834dc72) to head (5bace1e).
Report is 1 commits behind head on master.

Files	Patch %	Lines
lib/Doctrine/Import/Schema.php	0.00%	2 Missing ⚠️
lib/Doctrine/Cache/Memcache.php	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #346      +/-   ##
============================================
+ Coverage     69.85%   69.87%   +0.01%     
- Complexity     7815     7816       +1     
============================================
  Files           262      262              
  Lines         19080    18308     -772     
============================================
- Hits          13329    12792     -537     
+ Misses         5751     5516     -235     

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