Update version requirements

Author: ryancramerdesign

ProcessWireUpgrade.module

@@ -24,6 +24,7 @@ class ProcessWireUpgrade extends Process {
 			'version' => 7, 
 			'author' => 'Ryan Cramer', 
 			'installs' => 'ProcessWireUpgradeCheck', 
+			'requires' => 'ProcessWire>=2.5.20',
 			'icon' => 'coffee'
 			); 
 	}

README.md

@@ -28,7 +28,7 @@ what files to move.
 
 Options to upgrade from the master or dev branch are available. 
 
-This utility can be also used to upgrade any PW 2.3.4+ or newer 
+This utility can be also used to upgrade any PW 2.5.20+ or newer 
 site to the latest version.
 
 This utility makes versioned backup copies of any files it 
@@ -59,8 +59,6 @@ depending on your environment.
 
 ## Requirements
 
-- ProcessWire 2.3.4 or newer (for core upgrade capability)
-- ProcessWire 2.5.0 or newer (for module upgrade capability)
-- ProcessWire 2.5.20 or newer (for automatic upgrade checks)
+- ProcessWire 2.5.20 or newer