README: Add a missing word, thanks @imamathwiz

Closes gh-55

Author: dmethvin

README.md

@@ -45,7 +45,7 @@ The minified production file is compressed and does not generate console warning
 
 ## Migrate Plugin API
 
-This plugin adds three properties to the `jQuery` object that can be used programmatically control and examine its behavior:
+This plugin adds three properties to the `jQuery` object that can be used to programmatically control and examine its behavior:
 
 `jQuery.migrateWarnings`: This property is an array of string warning messages that have been generated by the code on the page, in the order they were generated. Messages appear in the array only once, even if the condition has occurred multiple times, unless `jQuery.migrateReset()` is called.