Run tests on PHP 7.4 and simply test matrix

.travis.yml

@@ -1,34 +1,30 @@
 language: php
 
-php:
-# - 5.3 # requires old distro, see below
-  - 5.4
-  - 5.5
-  - 5.6
-  - 7.0
-# - 7.0 # Mac OS X test setup, ignore errors, see below
-  - 7.1
-  - 7.2
-  - 7.3
-  - nightly # ignore errors, see below
-  - hhvm # ignore errors, see below
-
 # lock distro so new future defaults will not break the build
 dist: trusty
 
 matrix:
   include:
     - php: 5.3
       dist: precise
-  include:
+    - php: 5.4
+    - php: 5.5
+    - php: 5.6
+    - php: 7.0
+    - php: 7.1
+    - php: 7.2
+    - php: 7.3
+    - php: 7.4
+    - php: hhvm-3.18
+      install:
+        - composer require phpunit/phpunit:^5 --dev --no-interaction # requires legacy phpunit
     - os: osx
       language: generic
       php: 7.0 # just to look right on travis
       env:
         - PACKAGE: php70
   allow_failures:
-    - php: nightly
-    - php: hhvm
+    - php: hhvm-3.18
     - os: osx
 
 install: