Drop legacy HHVM support

Author: clue

.travis.yml

@@ -10,7 +10,6 @@ php:
   - 7.2
   - 7.3
   - 7.4
-  - hhvm # ignore errors, see below
 
 # lock distro so new future defaults will not break the build
 dist: xenial
@@ -23,8 +22,6 @@ matrix:
       dist: trusty
     - php: 5.5
       dist: trusty
-  allow_failures:
-    - php: hhvm
 
 sudo: false
 

README.md

@@ -480,8 +480,7 @@ $ composer require clue/mq-react:^1.1
 See also the [CHANGELOG](CHANGELOG.md) for details about version upgrades.
 
 This project aims to run on any platform and thus does not require any PHP
-extensions and supports running on legacy PHP 5.3 through current PHP 7+ and
-HHVM.
+extensions and supports running on legacy PHP 5.3 through current PHP 7+.
 It's *highly recommended to use PHP 7+* for this project.
 
 ## Tests