Bugfix : handle 1 slave that is the master

Merge pull request #45 from gregorg/fix_only_one_slave

fix when there is 1 slave which is also the master

exclude slaves with a weight of 0

Merge pull request #44 from gregorg/test_connect_only_once

Test connect only once

Bugfix

Merge pull request #42 from gregorg/master

fix error: MasterSlavesConnection::setSlaveStatus() must be of the ty…

Master/Slave distribution

Merge pull request #41 from gregorg/feature/handle_slave_delay

Feature: handle slave delay + fix master/slave distribution + fix unit tests

Update for php ^7.1

Merge pull request #39 from arsonik/master

update package for php ^7.1

v1.5.0

Merge pull request #38 from mathroc/feature/master-slaves-config-cach…

v1.4.3: Merge pull request #37 from folivaud/patch-1

Fix Slave

v1.4.2: Merge pull request #36 from PiR-B-/master

Keep master connection

v1.4.1: Merge pull request #35 from mathroc/fix/34

fix {Retry,MasterSlaves}Driver::get{Database,SchemaManager}

v1.4.0: Merge pull request #32 from mathroc/refactoring/unwrap-connections

avoid having nested Doctrine\DBAL\Connection-s