Update mink-extension requirement to stable version

MinkExtension has now a stable 2.0.0 tag, see https://github.com/Behat/MinkExtension/tree/v2.0.0
Merge branch 'EmmanuelVella/patch-3'
Throw exception on json inspector invalid index
Merge branch 'EmmanuelVella-json-inspector'
Fix multiple values headers
Merge branch 'EmmanuelVella-patch-1'
Decouple JsonContext from Mink

In order to use JsonContext without mink session
Merge branch 'tyx-feature/decouple-json-from-mink'
Update the integer casting to avoid matching trailing 0

A numeric string starting with a 0 should not be casted to an integer as this is loosing some chars. This is causing issues for some cases, for instance when entering a phone number in a field
Merge branch 'stof-patch-2'
Fix multidimensional request parameters
Merge branch 'EmmanuelVella-rest-params'
Fix ability to test json payload against json schema
Merge pull request #1 from gmorel/fix/allow_schema_deep_validation

Fix/allow schema deep validation