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Add `prefer-node-append` rule (#201)

* Add rule to prefer append over appendChild

 - Created a new entry in index.js for prefer-node-append.

 - Added a test for prefer-node-append.

* Simplify rule for prefer-node-append

Replace property at node level instead of constructing the fix manually.

* Add tests to ensure eslint does not crash

 - invalid case of node.appendChild()
 - invalid case of node.appendChild(null)
 - valid case of node.append()
 - valid case of node.append(null)
 - valid case of appending multiple nodes

* Add prefer-node-append rule in readme and docs

 - entry in usage section of readme
 - entry in rules section of readme
 - new rule doc for prefer-node-append

* Update prefer-node-append.md

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