Adding back tests for @paddatrapper

.travis.yml

@@ -36,9 +36,15 @@ jobs:
     - language: php
       php: 7.2
       stage: test
+    - language: php
+      php: 7.1
+      stage: test
     - language: php
       php: 7.0
       stage: test
+    - language: php
+      php: 5.6
+      stage: test
     - language: python
       python: 3.8
       stage: test
@@ -68,6 +74,8 @@ jobs:
       php: 7.3
     - language: php
       php: 7.2
+    - language: php
+      php: 7.1
     # https://github.com/LibreTime/libretime/issues/1041
     - language: python
       python: 3.5