Necessary fixes for 3.10.

Author: Mike Churchward

.travis.yml

@@ -1,7 +1,7 @@
 language: php
 
 addons:
-  postgresql: "9.5"
+  postgresql: "9.6"
 
 services:
   - mysql

CHANGES.md

@@ -3,9 +3,6 @@ Release Notes
 _NOTE - The 3.9 releases will work on Moodle 3.7, Moodle 3.8, Moodle 3.9, and 3.10.
 The 3.5 releases will work on Moodle 3.7, 3.6, 3.5, 3.4 and 3.3._
 
-Contributers to this release include The Open University, Joost van der Borg, Tien Nguyen, Luca Bösch, Simon Oulevay
-and Adrian Perez.
-
 ##### Version 3.9.1 (Build - 2020111801)
 Improvements:
 * Updates to deprecated unit test functions for 3.10.
@@ -33,4 +30,4 @@ Bug fixes:
 * [GHI300](https://github.com/PoetOS/moodle-mod_questionnaire/issues/300): Ensure that close date cannot be earlier than open date.
 * [PR304](https://github.com/PoetOS/moodle-mod_questionnaire/pull/304): Restoring regression that removed incomplete responses checkbox.
 
-(see CHANGES.TXT in release 3.8 for earlier changes.)
+(see CHANGES.TXT in release 3.8 for earlier changes.)