Update README.md

argh. Sorry. Another bit stuck out. We don't pluralize with an apostrophe.
mikel · Dec 3, 2018 · 1adeca1 · 1adeca1
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commit 1adeca1
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/README.md b/README.md
@@ -439,7 +439,7 @@ Content-Transfer-Encoding: 7bit
 ```
 
 Mail inserts the content transfer encoding, the mime version,
-the content-id's and handles the content-type and boundary.
+the content-IDs and handles the content-type and boundary.
 
 Mail assumes that if your text in the body is only us-ascii, that your
 transfer encoding is 7bit and it is text/plain. You can override this