Pass changeObject to onChange

[tonyjmnz]

There are cases where it's useful to know which type of change was made (specific key press, paste from clipboard) and while it is possible to achieve this by adding another change handler to the CodeMirror instance, this seems to be simple

From CodeMirror's docs:

"change" (instance: CodeMirror, changeObj: object)
Fires every time the content of the editor is changed. The changeObj is a {from, to, text, removed, origin} object containing information about the changes that occurred as second argument. from and to are the positions (in the pre-change coordinate system) where the change started and ended (for example, it might be {ch:0, line:18} if the position is at the beginning of line #19). text is an array of strings representing the text that replaced the changed range (split by line). removed is the text that used to be between from and to, which is overwritten by this change. This event is fired before the end of an operation, before the DOM updates happen.

[RIP21]

Deploy broken for some reason, but change is legit. Merging it. Will publish it tomorrow.

[RIP21]

Thanks for contribution!