Travis improvements (#90)

* Travis improvements

- Test php 7.4 (nightly)
- Use bionic

* PHP 7.4 fixes

* Fix coverage file

.editorconfig

@@ -13,3 +13,6 @@ trim_trailing_whitespace = true
 
 [*.md]
 trim_trailing_whitespace = false
+
+[*.yml]
+indent_size = 2

.travis.yml

@@ -1,12 +1,24 @@
 language: php
-dist: xenial
+dist: bionic
+os: linux
 
 php:
   - 7.2
   - 7.3
 
+jobs:
+  include:
+    - php: 7.4snapshot
+      before_install:
+        - pecl install xdebug
+    - php: nightly
+  allow_failures:
+    - php: 7.4snapshot
+    - php: nightly
+
+# Make sure all dev dependencies are installed, ignore platform requirements because Travis is missing the xdebug on some images
 before_script:
-  - composer install --no-interaction --prefer-dist
+  - composer install --no-interaction --prefer-dist --ignore-platform-reqs
 
 script:
   - mkdir -p build/logs

src/Response.php

@@ -188,7 +188,7 @@ private static function fetchApnsId(string $headers): string
      */
     private static function fetchErrorReason(string $body): string
     {
-        return json_decode($body, true)['reason'] ?: '';
+        return json_decode($body, true)['reason'] ?? '';
     }
 
     /**
@@ -202,7 +202,7 @@ private static function fetchErrorReason(string $body): string
     private static function fetch410Timestamp(int $statusCode, string $body): string
     {
         if ($statusCode === 410) {
-            return (string)(json_decode($body, true)['timestamp'] ?: '');
+            return (string)(json_decode($body, true)['timestamp'] ?? '');
         }
         return '';
     }
@@ -244,7 +244,7 @@ public function getStatusCode(): int
      */
     public function getReasonPhrase(): string
     {
-        return self::$reasonPhrases[$this->statusCode] ?: '';
+        return self::$reasonPhrases[$this->statusCode] ?? '';
     }
 
     /**