I agree with the others. I wouldn't label it as Second Edition unless you've made substantive changes.
If you're uploading through Kindle Direct, be aware that Amazon won't automatically make the new version available to customers who purchased the previous version. Even if they return the book and repurchase it, they'll still end up with the version they originally bought. (Weird? Yes.) They can get the updated version if they contact Amazon customer support, though.
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