README: Explain how to get a byte string from a buffer

Closes mathiasbynens/windows-1252#3. Thanks to @Simsso!

README.md

@@ -104,6 +104,8 @@ var text = koi8r.decode(encodedData, {
 // instead of replacing it with U+FFFD in the output, an error is thrown.
 ```
 
+For decoding a buffer (e.g. from `fs.readFile`) use `buffer.toString('binary')` to get the byte string which `decode` takes.
+
 ## Support
 
 _koi8-r_ is designed to work in at least Node.js v0.10.0, io.js v1.0.0, Narwhal 0.3.2, RingoJS 0.8-0.11, PhantomJS 1.9.0, Rhino 1.7RC4, as well as old and modern versions of Chrome, Firefox, Safari, Opera, Edge, and Internet Explorer.

data/index.txt

@@ -1,22 +1,19 @@
 # Any copyright is dedicated to the Public Domain.
-# https://creativecommons.org/publicdomain/zero/1.0/
+# http://creativecommons.org/publicdomain/zero/1.0/
 #
-# For details on index index-koi8-r.txt see the Encoding Standard
+# For details on index-koi8-r.txt see the Encoding Standard
 # https://encoding.spec.whatwg.org/
-#
-# Identifier: c5497cd9071cb352c0e56b219154e539badf63de40b71578f09e2e11fe7d50ae
-# Date: 2016-01-20
 
-  0	0x2500	─ (BOX DRAWINGS LIGHT HORIZONTAL)
-  1	0x2502	│ (BOX DRAWINGS LIGHT VERTICAL)
-  2	0x250C	┌ (BOX DRAWINGS LIGHT DOWN AND RIGHT)
-  3	0x2510	┐ (BOX DRAWINGS LIGHT DOWN AND LEFT)
-  4	0x2514	└ (BOX DRAWINGS LIGHT UP AND RIGHT)
-  5	0x2518	┘ (BOX DRAWINGS LIGHT UP AND LEFT)
-  6	0x251C	├ (BOX DRAWINGS LIGHT VERTICAL AND RIGHT)
-  7	0x2524	┤ (BOX DRAWINGS LIGHT VERTICAL AND LEFT)
-  8	0x252C	┬ (BOX DRAWINGS LIGHT DOWN AND HORIZONTAL)
-  9	0x2534	┴ (BOX DRAWINGS LIGHT UP AND HORIZONTAL)
+	0	0x2500	─ (BOX DRAWINGS LIGHT HORIZONTAL)
+	1	0x2502	│ (BOX DRAWINGS LIGHT VERTICAL)
+	2	0x250C	┌ (BOX DRAWINGS LIGHT DOWN AND RIGHT)
+	3	0x2510	┐ (BOX DRAWINGS LIGHT DOWN AND LEFT)
+	4	0x2514	└ (BOX DRAWINGS LIGHT UP AND RIGHT)
+	5	0x2518	┘ (BOX DRAWINGS LIGHT UP AND LEFT)
+	6	0x251C	├ (BOX DRAWINGS LIGHT VERTICAL AND RIGHT)
+	7	0x2524	┤ (BOX DRAWINGS LIGHT VERTICAL AND LEFT)
+	8	0x252C	┬ (BOX DRAWINGS LIGHT DOWN AND HORIZONTAL)
+	9	0x2534	┴ (BOX DRAWINGS LIGHT UP AND HORIZONTAL)
  10	0x253C	┼ (BOX DRAWINGS LIGHT VERTICAL AND HORIZONTAL)
  11	0x2580	▀ (UPPER HALF BLOCK)
  12	0x2584	▄ (LOWER HALF BLOCK)