update README to speak few words about SLIP encoding

Author: avilleret

README.md

@@ -1,7 +1,7 @@
 PacketSerial
 ============
 
-_PacketSerial_ is an small, efficient, library that allows [Arduinos](http://www.arduino.cc/) to send and receive serial data packets that include bytes with any value (0-255).  A _packet_ is simply an array of bytes.
+_PacketSerial_ is an small, efficient, library that allows [Arduinos](http://www.arduino.cc/) to send and receive serial data packets (with COBS or SLIP encoding) that include bytes with any value (0-255).  A _packet_ is simply an array of bytes.
 
 _"Why do I need this?"_ you may ask.  The truth is that you may not need it if you are converting your values to ASCII strings and separating them with a known character (like a new line `\n`) before sending them.   This is what happens if you call `Serial.print()` or `Serial.println()`.  For instance, if you just want to send a byte with the value of 255 and follow it with a new line character (i.e. `Serial.println(255)`) the Arduino automatically converts the number to the equivalent printable ASCII characters, sending 4 bytes total.  As a result the receiver won't just receive a byte for the number and a byte for the new line character.  Instead it will receive a stream of 4 bytes:
 
@@ -44,7 +44,8 @@ An alternative to ASCII encoding is to write the bytes directly to using the `Se
 10  // The new line character (\n).
 ```
 
-This is much more compact but can create problems when the user wants to send a _packet_ of data.  If the user wants to send a packet consisting of two values such as 255 and 10, we run into problems if we also use the new line ('\n' ASCII 10) character as a packet boundary.  This essentially means that the receiver will incorrectly think that a new packet is beginning when it receives the _value_ of 10.  Thus, to use this more compact form of sending bytes while reserving one value for a packet boundary marker.  Several unambiguous packet boundary marking encodings exist, but one with a small predictable overhead is called [Consistent Overhead Byte Stuffing](http://en.wikipedia.org/wiki/Consistent_Overhead_Byte_Stuffing).  For a raw packet of length `SIZE`, the maximum encoded buffer size will only be `SIZE + SIZE / 254 + 1`.  This is significantly less than ASCII encoding and the encoding / decoding algorithm is simple and fast.  In its default mode, the COBS encoding process simply removes all _zeros_ from the packet, allowing the sender and receiver to use the value of _zero_ as a packet boundary marker.  
+This is much more compact but can create problems when the user wants to send a _packet_ of data.  If the user wants to send a packet consisting of two values such as 255 and 10, we run into problems if we also use the new line ('\n' ASCII 10) character as a packet boundary.  This essentially means that the receiver will incorrectly think that a new packet is beginning when it receives the _value_ of 10.  Thus, to use this more compact form of sending bytes while reserving one value for a packet boundary marker.  Several unambiguous packet boundary marking encodings exist, but one with a small predictable overhead is called [Consistent Overhead Byte Stuffing](http://en.wikipedia.org/wiki/Consistent_Overhead_Byte_Stuffing).  For a raw packet of length `SIZE`, the maximum encoded buffer size will only be `SIZE + SIZE / 254 + 1`.  This is significantly less than ASCII encoding and the encoding / decoding algorithm is simple and fast.  In its default mode, the COBS encoding process simply removes all _zeros_ from the packet, allowing the sender and receiver to use the value of _zero_ as a packet boundary marker.
+Another coding available in PacketSerial is [Serial Line Internet Protocol](https://en.wikipedia.org/wiki/Serial_Line_Internet_Protocol) which is often used to send OSC over serial or TCP connection. To use SLIP encoding instead of COBS, use `SLIPPacketSerial` instead of `PacketSerial`. You can find some example about sending OSC data over serial in the [ofxSerial](https://github.com/bakercp/ofxSerial) repository.
 
 ## PacketSerial