Allow Symfony ^4.0

[yann-eugone]

Please let me know if there is something else I can do to help.

[yann-eugone]

I do not know your compatibility strategy so I tried to update Travis matrix to test everything, look like it is harder than expected, specialy because phpunit version is not required.

Can someone tell me how you want me to fix this ?

[gilles-g]

@yann-eugone Hi, Have a look on https://github.com/lexik/LexikJWTAuthenticationBundle/blob/master/.travis.yml

The strategy is to test for each php version, each symfony version

Maybe change the phpunit requirements for something like that "symfony/phpunit-bridge": "^3.4|^4.0",

[yann-eugone]

Maybe it is just me, but do you think that testing something like PHP 7.3 Symfony 2.7 is a good idea ?

[yann-eugone]

Tests are green, I had to replace symfony/phpunit-bridge with phpunit/phpunit to be sure of PHPUnit version

[gilles-g]

@yann-eugone look at this lines

https://github.com/lexik/LexikJWTAuthenticationBundle/blob/master/.travis.yml#L5-L13

We don't want to test php 7.3 with sf 2.7

Ah I understand, I said each php version for each sf version. It was a mistake :)

[yann-eugone]

Green again, matrix took ~11 minutes (instead of ~45 minutes previously) to run

[gilles-g]

Nice job! I will create a release