Bump dev dependencies. Remove PHP 7.1 from Travis configuration.

.gitignore

@@ -11,3 +11,5 @@ npm-debug.log
 .env
 composer.lock
 /bin/
+
+.phpunit.result.cache

.travis.yml

@@ -1,6 +1,5 @@
 language: php
 php:
-- '7.1'
 - '7.2'
 - '7.3'
 - '7.4'

composer.json

@@ -8,16 +8,17 @@
     "authors": [
         {
             "name": "Dawid Janik",
+            "role": "Maintainer",
             "email": "dawid.janik95@gmail.com",
             "homepage": "https://github.com/TheDoctor0"
         },
         {
-            "name": "Gaetan DELBART",
+            "name": "Gaetan Delbart",
             "email": "gaetan@moltencore.io",
             "homepage": "https://github.com/gagaXD"
         },
         {
-            "name": "Titouan BENOIT",
+            "name": "Titouan Benoit",
             "email": "titouan.benoit@gmx.fr",
             "homepage": "https://github.com/Nightbr"
         },
@@ -28,16 +29,15 @@
         }
     ],
     "require": {
-        "php": "^7.1.3",
         "laravel/framework": "~5.1|^6.0|^7.0",
         "mailjet/mailjet-apiv3-php": "^1.2",
         "mailjet/mailjet-swiftmailer": "^2.0"
     },
     "require-dev": {
-        "fzaninotto/faker": "~1.4",
-        "mockery/mockery": "0.9.*",
-        "phpunit/phpunit": "~7.0",
-        "orchestra/testbench": "3.6"
+        "fzaninotto/faker": "~1.9",
+        "mockery/mockery": "~1.3",
+        "phpunit/phpunit": "~8.5",
+        "orchestra/testbench": "~5.1"
     },
     "autoload": {
         "psr-4": {