Cannot install (problem with composer on PHP 7.2) about slack-php-api HOT 13 CLOSED

composer require puli/composer-plugin
                                                                                                                                                                                     
  [InvalidArgumentException]                                                                                                                                                         
  Could not find a version of package puli/composer-plugin matching your minimum-stability (stable). Require it with an explicit version constraint allowing its desired stability. 

Using version ^2.0 for php-http/curl-client
Using version ^1.5 for guzzlehttp/psr7
./composer.json has been created
Loading composer repositories with package information
Updating dependencies (including require-dev)
Package operations: 13 installs, 0 updates, 0 removals
  - Installing symfony/options-resolver (v4.2.4): Loading from cache
  - Installing psr/http-message (1.0.1): Loading from cache
  - Installing psr/http-factory (1.0.0): Loading from cache
  - Installing psr/http-client (1.0.0): Loading from cache
  - Installing clue/stream-filter (v1.4.0): Loading from cache
  - Installing php-http/message-factory (v1.0.2): Loading from cache
  - Installing php-http/message (1.7.2): Loading from cache
  - Installing php-http/promise (v1.0.0): Loading from cache
  - Installing php-http/httplug (v2.0.0): Loading from cache
  - Installing php-http/discovery (1.6.1): Loading from cache
  - Installing php-http/curl-client (2.0.0): Loading from cache
  - Installing ralouphie/getallheaders (2.0.5): Loading from cache
  - Installing guzzlehttp/psr7 (1.5.2): Loading from cache
php-http/message suggests installing zendframework/zend-diactoros (Used with Diactoros Factories)
php-http/message suggests installing slim/slim (Used with Slim Framework PSR-7 implementation)
php-http/discovery suggests installing puli/composer-plugin (Sets up Puli which is recommended for Discovery to work. Check http://docs.php-http.org/en/latest/discovery.html for more details.)

Using version ^1.1 for jolicode/slack-php-api
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Package operations: 17 installs, 0 updates, 0 removals
  - Installing php-http/client-common (2.0.0): Loading from cache
  - Installing php-http/multipart-stream-builder (1.0.0): Loading from cache
  - Installing symfony/polyfill-ctype (v1.11.0): Loading from cache
  - Installing symfony/yaml (v4.2.4): Loading from cache
  - Installing symfony/serializer (v4.2.4): Loading from cache
  - Installing php-jsonpointer/php-jsonpointer (v3.0.2): Loading from cache
  - Installing league/uri-parser (1.4.1): Loading from cache
  - Installing league/uri-interfaces (1.1.1): Loading from cache
  - Installing league/uri-schemes (1.2.1): Loading from cache
  - Installing psr/simple-cache (1.0.1): Loading from cache
  - Installing league/uri-hostname-parser (1.1.1): Loading from cache
  - Installing league/uri-components (1.8.2): Loading from cache
  - Installing league/uri-manipulations (1.5.0): Loading from cache
  - Installing jane-php/json-schema-runtime (v4.2.0): Loading from cache
  - Installing jane-php/open-api-runtime (v4.2.0): Loading from cache
  - Installing jolicode/slack-php-api (1.1.3): Loading from cache
php-http/client-common suggests installing php-http/logger-plugin (PSR-3 Logger plugin)
php-http/client-common suggests installing php-http/cache-plugin (PSR-6 Cache plugin)
php-http/client-common suggests installing php-http/stopwatch-plugin (Symfony Stopwatch plugin)
symfony/yaml suggests installing symfony/console (For validating YAML files using the lint command)
symfony/serializer suggests installing psr/cache-implementation (For using the metadata cache.)
symfony/serializer suggests installing symfony/property-info (To deserialize relations.)
symfony/serializer suggests installing symfony/config (For using the XML mapping loader.)
symfony/serializer suggests installing symfony/property-access (For using the ObjectNormalizer.)
symfony/serializer suggests installing symfony/http-foundation (To use the DataUriNormalizer.)
symfony/serializer suggests installing doctrine/annotations (For using the annotation mapping. You will also need doctrine/cache.)
symfony/serializer suggests installing doctrine/cache (For using the default cached annotation reader and metadata cache.)
league/uri-hostname-parser suggests installing psr/simple-cache-implementation (To enable using other cache providers)
Writing lock file
Generating autoload files

$client = JoliCode\Slack\ClientFactory::create($yourToken);

"require": {
        "php-http/curl-client": "^2.0",
        "guzzlehttp/psr7": "^1.5",
        "jolicode/slack-php-api": "^1.1"
    }

composer require zendframework/zend-diactoros

Http/Discovery/Exception/ClassInstantiationFailedException with message 'Unexpected exception when instantiating class.'

"php-http/curl-client": "^1.0",