Set database charset to utf8mb4 in config.yml

[bjorvack]

fixes #106
Sets the database charset to UTF8MB4.
The annotations for entities should add the options so migrations are made correctly

/**
 * @ORM\Entity
 * @ORM\Table(options={"collate":"utf8mb4_general_ci", "charset":"utf8mb4"})
 */ ```

[ohvitorino]

Will this fix my problem with wrong casing of tables names while executing migrations?

[tijsverkoyen]

Can somebody explain what this fixes, and why?

[carakas]

https://stackoverflow.com/a/30074553

[carakas]

@ohvitorino not that I'm aware of