Remove allow_failures flag from php 8

.travis.yml

@@ -23,8 +23,6 @@ matrix:
     - php: nightly
       dist: bionic
       env: COMPOSER_ARGS=--ignore-platform-reqs
-  allow_failures:
-    - php: nightly
 
 before_script:
   - echo "extension = redis.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini

CHANGELOG.md

@@ -3,6 +3,7 @@
   * Added `JSON_INVALID_UTF8_SUBSTITUTE` to default json flags, so that invalid UTF8 characters now get converted to [�](https://en.wikipedia.org/wiki/Specials_(Unicode_block)#Replacement_character) instead of being converted from ISO-8859-15 to UTF8 as it was before, which was hardly a comprehensive solution
   * Added `$ignoreEmptyContextAndExtra` option to JsonFormatter to skip empty context/extra entirely from the output
   * Added `$parseMode`, `$disableWebPagePreview` and `$disableNotification` options to TelegramBotHandler
+  * Added tentative support for PHP 8
   * NormalizerFormatter::addJsonEncodeOption and removeJsonEncodeOption are now public to allow modifying default json flags
   * Fixed GitProcessor type error when there is no git repo present
   * Fixed normalization of SoapFault objects containing deeply nested objects as "detail"