Changed description to reflect OSI model naming.

Author: mjpt777

README.md

@@ -2,7 +2,7 @@ Simple Binary Encoding (SBE)
 ============================
 
 [SBE](http://www.fixtradingcommunity.org/pg/file/fplpo/read/46939/simple-binary-encoding-specification
-) is OSI layer 6 representation for encoding and decoding application messages in binary format for low-latency applications.
+) is OSI layer 6 presentation for encoding and decoding application messages in binary format for low-latency applications.
 
 Further details on the background and usage of SBE can be found on the [Wiki](https://github.com/real-logic/simple-binary-encoding/wiki).