Add support for psr/http-message ^2.0

[damcou]

This includes:

• Changes coming from @Stoux (<3) : Add support for psr/http-message ^2.0 #717
• Fixed linter
• Fixed CI
• Dropped PHP 7.2

[jacobclarke92]

Just FYI this actually breaks support with psr/http-message ^1
Probably worth changing composer file to reflect that.
Solution for me was to pin to 3.3.2

Reason why it breaks is because of a bunch of bunch of return type incompatibilities e.g.

Fatal error:  
Declaration of Algolia\AlgoliaSearch\Http\Psr7\Uri::withScheme(string $scheme): Psr\Http\Message\UriInterface must be compatible with Psr\Http\Message\UriInterface::withScheme($scheme)  
in /Users/jacobclarke/Projects/hutchies/vendor/algolia/algoliasearch-client-php/src/Http/Psr7/Uri.php  
on line 439

[Stoux]

I've missed that, didn't test it with the lowest version. It does indeed break on psr/http-message:~1.0.0 as it sees the new types as more restrictive and thus deem it incompatible.

@damcou Bumping the requirement to "psr/http-message": "^1.1 || ^2.0", should suffice, otherwise you would have to revert the 2.0 support.

@jacobclarke92 Upgrading psr/http-message to 1.1 (or 2.0) should fix it, if you don't have any dependencies that lock it to 1.0 of course.

[damcou]

I've missed that, didn't test it with the lowest version. It does indeed break on psr/http-message:~1.0.0 as it sees the new types as more restrictive and thus deem it incompatible.

@damcou Bumping the requirement to "psr/http-message": "^1.1 || ^2.0", should suffice, otherwise you would have to revert the 2.0 support.

Just released v3.4.1 with this changes which should indeed solve the issue.
Thanks for the suggestion !