Test 7.3 and 7.4 (#168)

Author: Nick

.travis.yml

@@ -7,10 +7,14 @@ env:
   matrix:
     - PHP_VERSION=7.0 IMAGE_FLAVOUR=cli
     - PHP_VERSION=7.0 IMAGE_FLAVOUR=fpm
-    - PHP_VERSION=7.1 IMAGE_FLAVOUR=fpm
     - PHP_VERSION=7.1 IMAGE_FLAVOUR=cli
+    - PHP_VERSION=7.1 IMAGE_FLAVOUR=fpm
     - PHP_VERSION=7.2 IMAGE_FLAVOUR=cli
     - PHP_VERSION=7.2 IMAGE_FLAVOUR=fpm
+    - PHP_VERSION=7.3 IMAGE_FLAVOUR=cli
+    - PHP_VERSION=7.3 IMAGE_FLAVOUR=fpm
+    - PHP_VERSION=7.4 IMAGE_FLAVOUR=cli
+    - PHP_VERSION=7.4 IMAGE_FLAVOUR=fpm
 
 script:
-  - bash test-runner.sh
+  - bash test-runner.sh