Update README to specify that output.txt needs to use UTF-8 encoding

I'm running into a lot of problems with Fatheads using the wrong
encoding. The processing scripts look for UTF-8 and often don't work
if some other encoding is used.

README.md

@@ -98,6 +98,8 @@ Keywords: jQuery
 
 Please name the output file output.txt (tab delimited) but do not store the data file(s) in the repository (as noted above) unless it is under 1MB.
 
+The output file needs to use UTF-8 encoding so we can process it. Please make sure you write your parse scripts accordingly or we'll probably run into some problems getting it integrated.
+
 The output format from parse.xx depends on the type of content. In any case, it should be a tab delimited file, with one line per entry. Usually there is no need for newline characters, but if there is a need for some reason, escape them with a backslash like \\\n. If you wanta newline displayed, use <br>
 
 The general output fields are as follows. Check out [https://duckduckgo.com/Perl](https://duckduckgo.com/Perl) for reference, which we will refer to in explaining the fields.