Update php unit. Update Test for php7.2

Author: Южаков Георгий

.gitignore

@@ -4,3 +4,4 @@ vendor
 examples/init.php
 atlassian-ide-plugin.xml
 nbproject/
+.phpunit.result.cache

.travis.yml

@@ -2,20 +2,18 @@ sudo: false
 language: php
 
 php:
-  - 5.4
-  - 5.5
-  - 5.6
-  - 7.0
-  - hhvm
- 
+  - 7.2
+  - 7.3
+  - 7.4
+  - 8.0
 matrix:
     allow_failures:
-        - php: hhvm
+        - php: 8.0
 
 before_script:
   - composer self-update
   - composer install
   - phpenv rehash
 
 script:
-  - phpunit --coverage-text
+  - ./vendor/bin/phpunit --coverage-text

composer.json

@@ -18,28 +18,34 @@
         }
     ],
     "require": {
-        "php": ">=5.3.0",
-        "ext-dom": "*",
-        "ext-curl": "*",
-        "ext-json": "*"
+        "php": "^7.2"
     },
     "require-dev": {
+        "ext-dom": "*",
+        "ext-curl": "*",
+        "ext-json": "*",
         "symfony/http-foundation": "~2.1",
         "predis/predis": "0.8.*@dev",
-        "phpunit/phpunit": "3.7.*",
-        "squizlabs/php_codesniffer": "2.*"
+        "squizlabs/php_codesniffer": "2.*",
+        "phpunit/phpunit": "8.5"
     },
     "suggest": {
         "symfony/http-foundation": "Allows using the Symfony Session storage backend.",
         "predis/predis": "Allows using the Redis storage backend.",
         "ext-openssl": "Allows for usage of secure connections with the stream-based HTTP client."
     },
     "autoload": {
-        "psr-0": {
-            "OAuth": "src",
-            "OAuth\\Unit": "tests"
+        "psr-4": {
+            "OAuth\\": "src/OAuth"
+        }
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "OAuthTest\\Unit\\": "tests/Unit",
+            "OAuthTest\\Mocks\\": "tests/Mocks"
         }
     },
+
     "extra": {
         "branch-alias": {
             "dev-master": "0.1-dev"