Adding support for php 7.3 and 7.4 in branch 3.6
Adding support for php 7.3 and 7.4 in branch 3.6

malarzm/DoctrineMongoDBBundle,alcaeus/DoctrineMongoDBBundle,malarzm/DoctrineMongoDBBundle,alcaeus/DoctrineMongoDBBundle,doctrine/DoctrineMongoDBBundle