1.5.0

• Update ppa:ondrej/php before install.
• Cache node_modules in test workflows.
• Improve documentation and templates.
• Add dependency cache section using action/cache.
• Revert to apt-get for installing extensions.
• Remove windows-2016 support.
• Bump macOS-latest version to macOS X Catalina 10.15.
• Add PECL support on ubuntu as fallback.
• Install extensions on PHP7.4 using ppa:ondrej/php.