Composer installs a package not present in .json file - json

Question

I am using Laravel 5.4 with composer and when i try to install some requirement bash tells me:
Package illuminate/html is abandoned, you should avoid using it. Use laravelcollective/html instead.
Which is perfectly ok, illuminate/html is abandoned and i replaced it with the laravelcollective/html package in composer.json file, which is included in the following code snippet, but the problem is that even though illuminate/html is not present in composer.json file, it is installed when i issue the composer update command in console. I am very new to Laravel fw, but i also managed to remove illuminate/html from aliases and providers arrays in config/app.php file. I also tried several times manually removing illuminate/html folder from the vendor directory, which succeeded, but with new composer update it returns...
How can i delete this package and ensure, that it wont install itself next time i add new package with composer?
PS: I am not sure whether it has something to do with my problem, but i also had problem with post-update-cmd, which i replaced from previous "php artisan optimize" to "php customisan.php", where customisan.php will clear folder bootstrap/cache and all of its content.
{
"name": "laravel/laravel",
"description": "The Laravel Framework.",
"keywords": ["framework", "laravel"],
"license": "MIT",
"type": "project",
"require": {
"php": ">=5.6.4",
"illuminate/support": "^5.4",
"laravel/framework": "5.4.*",
"laravel/passport": "^2.0",
"laravel/tinker": "~1.0",
"laravelcollective/html": "^5.4.0",
"yajra/laravel-oci8": "^5.4"
},
"require-dev": {
"fzaninotto/faker": "~1.4",
"mockery/mockery": "0.9.*",
"phpunit/phpunit": "~5.7"
},
"autoload": {
"classmap": [
"database"
],
"psr-4": {
"App\\": "app/"
}
},
"autoload-dev": {
"psr-4": {
"Tests\\": "tests/"
}
},
"scripts": {
"post-root-package-install": [
"php -r \"file_exists('.env') || copy('.env.example', '.env');\""
],
"post-create-project-cmd": [
"php artisan key:generate"
],
"post-install-cmd": [
"Illuminate\\Foundation\\ComposerScripts::postInstall",
"php artisan optimize"
],
"post-update-cmd": [
"Illuminate\\Foundation\\ComposerScripts::postUpdate",
"php customisan.php"
]
},
"config": {
"preferred-install": "dist",
"sort-packages": true
}
}

Answer 1

If anyone experiences similar problem, #devk's answer should help.
All i had to do was issue composer update command in console.
Further explanation provided in #devk's answer...