1.8.7

v1 maintenance release

• Recompile PCOV binaries with latest PHP 8.0 on windows.
• Update formulae for PHP 8.0 on macOS before setup.
• Update dependencies.
• Setup libzip-dev to fix symbol error in PHP 8.0 on ubuntu.
• Fix icu4c version for PHP 5.6 and 7.0 on macOS.
• Fix loading PECL extensions. Fixes #217