Remove php7.4 support, fix Travis CI

Author: miks

.travis.yml

@@ -1,15 +1,14 @@
 language: php
 
 php:
-  - 7.4
   - 8.0
+  - 8.1
 
 env:
   global:
     - setup=basic
     - XDEBUG_MODE=coverage
 
-
 sudo: false
 
 before_install:

README.md

@@ -1,7 +1,7 @@
 # Omnipay: Worldline
 
-[![Build Status](https://travis-ci.org/arbory/omnipay-worldline.svg?branch=master)](https://travis-ci.org/arbory/omnipay-worldline)
-[![Coverage Status](https://coveralls.io/repos/github/arbory/omnipay-worldline/badge.svg?branch=master)](https://coveralls.io/github/arbory/omnipay-worldline?branch=master)
+[![Build Status](https://app.travis-ci.com/arbory/omnipay-wordline.svg?branch=master)](https://app.travis-ci.com/arbory/omnipay-wordline)
+[![Coverage Status](https://coveralls.io/repos/github/arbory/omnipay-wordline/badge.svg?branch=master)](https://coveralls.io/github/arbory/omnipay-wordline?branch=master)
 
 Worldline Gateway for Omnipay payment processing library.  
 This gateway is different from global payeezy gateway and is mainly used only in Latvia.

composer.json

@@ -12,6 +12,7 @@
         "php-http/guzzle7-adapter": "^1.0"
     },
     "require-dev": {
+      "php": "^8.0|^8.1",
       "omnipay/tests": "^4",
       "squizlabs/php_codesniffer": "^3",
       "phpro/grumphp": "^1",