Updated "newsletter" exercise

Added the hint about "simplifile" - which should be used for all the file operations.
exercism · Nov 25, 2023 · ff55a3f · ff55a3f
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 Boris is a big model train enthusiast and has decided to share their passion with the world by starting a newsletter. They'll start by sending the first issue of the newsletter to friends and acquaintances that share the hobby, their email addresses are stored in a text file.
 
+Hint: Use the [simplifile](https://hexdocs.pm/simplifile/simplifile.html) module for file operations.
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 ## 1. Read email addresses from a file
 
 Implement the `read_emails` function. It takes a path string to a text file that contains email addresses separated by newlines, and returns a list of the email addresses from the file.