Preparing sf5 compatibility

[Spomky]

Will fix #227

[coveralls]

Coverage decreased (-0.01%) to 73.523% when pulling 53cdc69 on sf5 into 9293657 on v2.1.

[lucasvanlierop]

Nice, thanks!, I'll give this a try tomorrow!

[rderocle]

Hi guys, is the project available for symfony 5? I have a composer message when I try to install :

`
➜ api git:(master) ✗ composer require web-token/jwt-framework:"^2.1"
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Restricting packages listed in "symfony/symfony" to "5.0.*"
Your requirements could not be resolved to an installable set of packages.

Problem 1
- web-token/jwt-framework v2.1.1 requires symfony/config ^4.2 -> no matching package found.
- web-token/jwt-framework v2.1.0 requires symfony/config ^4.2 -> no matching package found.
- Installation request for web-token/jwt-framework ^2.1 -> satisfiable by web-token/jwt-framework[v2.1.0, v2.1.1].

Potential causes:

• A typo in the package name
• The package is not available in a stable-enough version according to your minimum-stability setting
  see https://getcomposer.org/doc/04-schema.md#minimum-stability for more details.
• It's a private package and you forgot to add a custom repository to find it

Read https://getcomposer.org/doc/articles/troubleshooting.md for further common problems.

Installation failed, reverting ./composer.json to its original content.
`

[Spomky]

Hi @monsieurchico,

It is not yet tagged. This should be done by the end of the week.

[rderocle]

Okay thanks ;)