Merge pull request #453 from acelaya/feature/php-7.4

Added PHP 7.4 to the build matrix, but allowing it to fail

.travis.yml

@@ -5,8 +5,13 @@ branches:
     - /.*/
 
 php:
-  - 7.2
-  - 7.3
+  - '7.2'
+  - '7.3'
+  - '7.4'
+
+matrix:
+  allow_failures:
+    - php: '7.4'
 
 services:
   - mysql

CHANGELOG.md

@@ -12,7 +12,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com), and this
 
 #### Changed
 
-* *Nothing*
+* [#450](https://github.com/shlinkio/shlink/issues/450) Added PHP 7.4 to the build matrix, as an allowed-to-fail env.
 
 #### Deprecated