INT-11392 local_aws_sdk: Downgraded required Moodle version to 2.9 and added environment check

Author: Darko Miletic

environment.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<COMPATIBILITY_MATRIX>
+    <PLUGIN name="local_aws_sdk">
+        <PHP version="5.5" level="required" />
+    </PLUGIN>
+</COMPATIBILITY_MATRIX>

version.php

@@ -26,7 +26,7 @@
 
 /** @var stdClass $plugin */
 $plugin->version   = 2016111600;
-$plugin->requires  = 2016052301;
+$plugin->requires  = 2015051100;
 $plugin->component = 'local_aws_sdk';
 $plugin->maturity  = MATURITY_STABLE;
 $plugin->release   = '3.1.3 (Build: 20161114)';