Test against PHP 7.4

.travis.yml

@@ -1,5 +1,5 @@
 sudo: required
-dist: precise
+dist: trusty
 language: php
 php:
 - 5.3
@@ -10,11 +10,24 @@ php:
 - 7.1
 - 7.2
 - 7.3
+- 7.4
 - hhvm
 matrix:
   allow_failures:
   - php: hhvm
   fast_finish: true
+  include:
+    - php: 5.3
+      dist: precise
+    - php: 5.4
+    - php: 5.5
+    - php: 5.6
+    - php: 7.0
+    - php: 7.1
+    - php: 7.2
+    - php: 7.3
+    - php: 7.4
+    - php: hhvm
 before_script:
 - composer self-update
 - composer install --dev

composer.json

@@ -1,28 +1,28 @@
-{
-    "name": "paypal/rest-api-sdk-php",
-    "description": "PayPal's PHP SDK for REST APIs",
-    "keywords": ["paypal", "payments", "rest", "sdk"],
-    "type": "library",
-    "license": "Apache-2.0",
-    "homepage": "http://paypal.github.io/PayPal-PHP-SDK/",
-    "authors": [
-        {
-            "name": "PayPal",
-            "homepage": "https://github.com/paypal/rest-api-sdk-php/contributors"
-        }
-    ],
-    "require": {
-        "php": ">=5.3.0",
-        "ext-curl": "*",
-        "ext-json": "*",
-        "psr/log": "^1.0.0"
-    },
-    "require-dev": {
-        "phpunit/phpunit": "^4.8.35"
-    },
-    "autoload": {
-        "psr-0": {
-            "PayPal": "lib/"
-        }
-    }
-}
+{
+    "name": "paypal/rest-api-sdk-php",
+    "description": "PayPal's PHP SDK for REST APIs",
+    "keywords": ["paypal", "payments", "rest", "sdk"],
+    "type": "library",
+    "license": "Apache-2.0",
+    "homepage": "http://paypal.github.io/PayPal-PHP-SDK/",
+    "authors": [
+        {
+            "name": "PayPal",
+            "homepage": "https://github.com/paypal/rest-api-sdk-php/contributors"
+        }
+    ],
+    "require": {
+        "php": ">=5.3.0",
+        "ext-curl": "*",
+        "ext-json": "*",
+        "psr/log": "^1.0.0"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^4.8.35|^6.3"
+    },
+    "autoload": {
+        "psr-0": {
+            "PayPal": "lib/"
+        }
+    }
+}