fix #100 update deprecated constants in doctrine

[JasonMartoux]

fix #100 deprecated constant Lexer for TokenType constant in doctrine/orm 2.19 see here

[MaximeThoonsen]

Hey @JasonMartoux,
I think we need to add support for multiple Doctrine version to make this works

[JasonMartoux]

@MaximeThoonsen Hey !
The deprecation started at the version 2.19 of doctrine/orm.
I've forked the repo yesterday (Omega good job by the way 👍 mate ), and got the issue. Maybe update the doc in the meantime ?

[MaximeThoonsen]

Hey @JasonMartoux ,
Thanks for the kind words!
Yes you are right, I will update the doc. Do you want to suggest a fix that works for many doctrine version?

[JasonMartoux]

@MaximeThoonsen just fix the version in the composer file ?

[MaximeThoonsen]

@JasonMartoux no because we want to let as many people as possible use it and they all have different version. We don't want to create a version conflict