v2.6.0 Fluid field type support, extended relationships data, bugfixes

Update README.md

v2.5.2 Bugfixes and cleanup

• Bugfix: Updated the members function to handle both legacy (pre EE4) and newer member data
• Added json_pretty_print parameter for better readable output. Handy in the development stage
• Code cleanup
• Updated README

v2.5.1 Bugfixes

- Bugfix: Removed all remnants of fluid field data, since the Fluid fieldtype is not (yet) supported. The remnant data is unusable at this point. Working on support for Fluid fieldtype
- Bugfix: Updated the `members` function to fit EE6.x
- Changed `addon.setup.php` and cleaned it up

v2.5.0 JSON Output for EE4, EE5 & EE6

Reversed previous commit

v1.1.9 JSON Output for EE2 & EE3

Requirements: ExpressionEngine 2.6+ or 3.x