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All-uppercase letters stand out and make the file easily visible which makes sense because it is probably the first thing a new user would want to look at. (Or, at least, should have looked at) Also file names starting with a capital letter will be listed before lower-case names in ASCII alphabetical sorting (LC_COLLATE=C) which helps make the file visible at a first glance.
Here is the more details about it : http://softwareengineering.stackexchange.com/questions/301691/readme-txt-vs-readme-txt
Also tell future contributors to follow this style. :)