Bump PHP version requirement to 7.2.0+

Bug: T216165
Bug: T216166
Change-Id: I99e45c2a8fd1512a76a42ce978cb96f39ee2456e

.travis.yml

@@ -26,8 +26,6 @@ matrix:
   include:
     - php: 7.3
     - php: 7.2
-    - php: 7.1
-    - php: 7
 
 services:
   - mysql

INSTALL

@@ -7,7 +7,7 @@ Starting with MediaWiki 1.2.0, it's possible to install and configure the wiki
 
 Required software as of MediaWiki 1.34.0:
 
-* Web server with PHP 7.0.13 or higher, plus the following extesnsions:
+* Web server with PHP 7.2.0 or higher, plus the following extesnsions:
 ** ctype
 ** dom
 ** fileinfo

RELEASE-NOTES-1.34

@@ -570,8 +570,8 @@ because of Phabricator reports.
 * …
 
 == Compatibility ==
-MediaWiki 1.34 requires PHP 7.0.13 or later. Although HHVM 3.18.5 or later is
-supported, it is generally advised to use PHP 7.0.13 or later for long term
+MediaWiki 1.34 requires PHP 7.2.0 or later. Although HHVM 3.18.5 or later is
+supported, it is generally advised to use PHP 7.2.0 or later for long term
 support. It also requires the following PHP extensions:
 
 * ctype

includes/PHPVersionCheck.php

@@ -108,8 +108,8 @@ class PHPVersionCheck {
 			'implementation' => 'PHP',
 			'version' => PHP_VERSION,
 			'vendor' => 'the PHP Group',
-			'upstreamSupported' => '5.6.0',
-			'minSupported' => '7.0.13',
+			'upstreamSupported' => '7.1.0',
+			'minSupported' => '7.2.0',
 			'upgradeURL' => 'https://www.php.net/downloads.php',
 		);
 	}