docs: add note on binary character set type casting

dougwilson · seangarner · commit 5c176d55db02 · 2015-05-11T23:14:37.000+01:00
closes mysqljs#1071
diff --git a/Readme.md b/Readme.md
@@ -1164,6 +1164,9 @@ types by default. The following mappings exist:
 
 ### String
 
+**Note** text in the binary character set is returned as `Buffer`, rather
+than a string.
+
 * CHAR
 * VARCHAR
 * TINYTEXT
