add downloads last month to readme
add downloads last month to readme

adelf/idea-php-dotenv-plugin,adelf/idea-php-dotenv-plugin,adelf/idea-php-dotenv-plugin,adelf/idea-php-dotenv-plugin,adelf/idea-php-dotenv-plugin,adelf/idea-php-dotenv-plugin,adelf/idea-php-dotenv-plugin,adelf/idea-php-dotenv-plugin