Fix build

[jordisala1991]

Subject

I am targeting this branch, because this is BC.

Not the perfect solution, but this allow the build to pass:

composer/composer#9157

Changelog

### Removed
- Support for `sonata-project/exporter` < 2.0

[codecov-commenter]

Codecov Report

Merging #416 into 2.x will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##                2.x     #416   +/-   ##
=========================================
  Coverage     35.39%   35.39%           
  Complexity      210      210           
=========================================
  Files            26       26           
  Lines           904      904           
=========================================
  Hits            320      320           
  Misses          584      584           

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[greg0ire]

Thanks @jordisala1991 !