readLine
Read a line of text. #lt are compressed into single newline ('\n') characters. The current line number is incremented whenever a line terminator is read, or when the end of the stream is reached and the last character in the stream is not a line terminator.
Return
A String containing the contents of the line, not including any #lt, or null if the end of the stream has been reached
Throws
IOException
If an I/O error occurs