update compatibility to SS >=3.1

README.md

@@ -8,7 +8,7 @@ Included are:
 Take a look at the [Notes](#notes) and [TODOs](#todo).
 
 ## Requirments
-* SilverStripe 3.0
+* SilverStripe 3.1
 
 ## Installation
 * Download and copy module in SilverStripe root directory and name it whatever you want

composer.json

@@ -15,6 +15,6 @@
     "url": "git@github.com:colymba/GridFieldBulkEditingTools.git"
   }],
 	"require": {
-    "silverstripe/cms": "3.*"
+    "silverstripe/cms": ">=3.1"
 	}
 }