Upgrading symfony/filesystem allowed versions

This makes the package compatible with symfony/filesystem 4

Adding SQL dumper capability

See #33

Adding small utility method for installer

See #32

Adds support for DB resets

This release adds support for database resets.

Patches as PHP code

Allows creating patches via PHP code (using DBAL schema builder)

Bugfix release

Fixes rare race condition when creating patch

Fix patch generation

Merge pull request #17 from xhuberty/2.0

Fix bug on patch generation

Bugfix release

Merge pull request #16 from marcteyssier/2.0

Fix bug for DBAL

Fixing missing primary key in patches table

Merge pull request #15 from marcteyssier/2.0

Add primary key for DBAL

Bugfix release

Fixing patches table detection