readUntilBytes function add

README.md

@@ -206,6 +206,10 @@ func readChar() throws -> UnicodeScalar
 ```
 Read only one character. This works best if `minimumBytesToRead` has been set to `1` when opening the port. This function internally calls `readByte()`.
 
+```swift
+func readUntilBytes(stopBytes: [UInt8], maxBytes: Int) throws -> [UInt8]
+```
+Read bytes until stop bytes found or maxBytes count was recieved
 ### Writing data to the port
 
 There are several functions you can use to write data. All functions here are blocking till all the data has been written. All functions can throw `PortError.mustBeOpen`.