Removed mentions of passwords from the readme.

Author: LewisW

README.md

@@ -1,7 +1,7 @@
 # StringGeneratorBundle
 
 This bundle allows you to automatically generate a unique random string on an entity property, useful for
-creating keys or passwords. Using Doctrine's `prePersist` callback, StringGenerator adds the generated string to a property
+creating keys. Using Doctrine's `prePersist` callback, StringGenerator adds the generated string to a property
 before the entity is persisted. It also checks whether the string is unique to that property (just in case) and if not, quietly
 generates a new string.