added support for PHP8

manay PHPunit BCs...

Author: brainexe

.travis.yml

@@ -1,11 +1,11 @@
 language: php
 
 php:
-  - 7.1
   - 7.2
   - 7.3
   - 7.4
   - 8.0
+  - nightly
 
 sudo: false
 

composer.json

@@ -12,11 +12,11 @@
         }
     ],
     "require": {
-        "php": "^7.1|^8.0"
+        "php": "^7.2|^8.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "~9.2",
-        "mockery/mockery": "~1.4",
+        "phpunit/phpunit": "~8.0 | ~9.2",
+        "mockery/mockery": "~1.3",
         "guzzlehttp/guzzle": "~5.0"
     },
     "suggest": {