docs(readme): update php requirement and package version

Update the README.md to correctly reflect the minimum PHP version requirement of 8.2 and update the package version constraint to ^1.0, matching the current composer.json configuration.

Additionally, update the .devcontainer/Dockerfile to use the official php:8.2-cli base image. This ensures that the development environment remains consistent with the project's requirements, replacing the outdated Ubuntu 20.04/PHP 7.4 setup with a modern, extension-enabled PHP 8.2 environment including Xdebug.

Author: XternalSoft

.devcontainer/Dockerfile

@@ -1,18 +1,18 @@
-FROM ubuntu:20.04
+FROM php:8.2-cli
 
-RUN export DEBIAN_FRONTEND=noninteractive \
-    && apt update \
-    && apt install -y php7.4-cli php7.4-dev php7.4-mbstring php7.4-curl php7.4-intl git zip unzip libicu-dev
+RUN apt update && apt install -y \
+    git \
+    zip \
+    unzip \
+    libicu-dev \
+    libcurl4-openssl-dev \
+    libonig-dev
 
-RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
+RUN docker-php-ext-install intl mbstring curl
+
+RUN pecl install xdebug && docker-php-ext-enable xdebug
 
-RUN mkdir -p /xdebug && git clone https://github.com/xdebug/xdebug.git --recursive --branch 3.1.0 /xdebug
-RUN cd /xdebug \
-    && phpize \
-    && ./configure --enable-xdebug \
-    && make \
-    && make install \
-    && echo 'zend_extension=xdebug' > /etc/php/7.4/cli/conf.d/99-xdebug.ini
+RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
 
 RUN php -v
 

README.md

@@ -26,7 +26,7 @@ It is strongly recommended to:
 ## Installation
 
 ##### System requirements:
-* PHP >= __7.2__ (old versions supports __5.4+__)
+* PHP >= __8.2__
 * php-curl
 * php-mbstring
 * Open port __43__ in firewall
@@ -45,7 +45,7 @@ composer require xternalsoft/php-whois
 or composer.json:
 ````
 "require": {
-    "xternalsoft/php-whois": "^4.0"
+    "xternalsoft/php-whois": "^1.0"
 }
 ````