chore(project): update license

Related to bpmn-io/bpmn.io#16

Author: nikku

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2015 camunda services GmbH
+Copyright (c) 2015-2016 camunda services GmbH
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of
 this software and associated documentation files (the "Software"), to deal in the
@@ -12,7 +12,8 @@ copies or substantial portions of the Software.
 
 The source code responsible for displaying the bpmn.io logo (two green cogwheels in
 a box) that links back to http://bpmn.io as part of rendered tables MUST NOT be
-removed or changed.
+removed or changed. When this software is being used in a website or application,
+the logo must stay fully visible and not visually overlapped by other elements.
 
 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
 INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR