Revert "📈 Add GlitchTip"

This reverts commit d5679a626d.

vendor/symfony/polyfill-php70/README.md

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-Symfony Polyfill / Php70
-========================
-
-This component provides features unavailable in releases prior to PHP 7.0:
-
-- [`intdiv`](https://php.net/intdiv)
-- [`preg_replace_callback_array`](https://php.net/preg_replace_callback_array)
-- [`error_clear_last`](https://php.net/error_clear_last)
-- `random_bytes` and `random_int` (from [paragonie/random_compat](https://github.com/paragonie/random_compat))
-- [`*Error` throwable classes](https://php.net/Error)
-- [`PHP_INT_MIN`](https://php.net/reserved.constants#constant.php-int-min)
-- `SessionUpdateTimestampHandlerInterface`
-
-More information can be found in the
-[main Polyfill README](https://github.com/symfony/polyfill/blob/master/README.md).
-
-Compatibility notes
-===================
-
-To write portable code between PHP5 and PHP7, some care must be taken:
-- `\*Error` exceptions must be caught before `\Exception`;
-- after calling `error_clear_last()`, the result of `$e = error_get_last()` must be
-  verified using `isset($e['message'][0])` instead of `null !== $e`.
-
-License
-=======
-
-This library is released under the [MIT license](LICENSE).