CI tests with php 8.0 (#64)

Add PHP 8.0 to CI tests,
Drop PHP 7.0 - 7.2 from CI Test (due upgraded phpunit requirements - these are versions EOL)

Author: aldas

.github/workflows/php.yml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       matrix:
         operating-system: [ubuntu-latest]
-        php-version: ['7.0', '7.1', '7.2', '7.3', '7.4']
+        php-version: ['7.3', '7.4', '8.0']
     name: PHP ${{ matrix.php-version }} Test on ${{ matrix.operating-system }}
     steps:
     - uses: actions/checkout@v2

.travis.yml

@@ -7,16 +7,19 @@ cache:
         - $HOME/.composer/cache
 
 php:
-    - 7.0
-    - 7.1
-    - 7.2
     - 7.3
     - 7.4
+    - nightly
 
 env:
     - ARCH=64bit
     - ARCH=32bit
 
+matrix:
+    exclude:
+        - php: nightly
+          env: ARCH=32bit
+
 before_install:
     - travis_retry composer self-update
 

composer.json

@@ -7,13 +7,13 @@
   "type": "library",
   "license": "Apache-2.0",
   "require": {
-    "php": "^7.0"
+    "php": "^7.0 || ^8.0"
   },
   "require-dev": {
-    "phpunit/phpunit": "^6.0",
-    "react/datagram": "^1.4",
-    "react/socket": "^0.8",
-    "react/child-process": "^0.5.2",
+    "phpunit/phpunit": "^9.0",
+    "react/datagram": "^1.5",
+    "react/socket": "^1.6",
+    "react/child-process": "^0.6",
     "psr/log": "^1.0"
   },
   "suggest": {