Update README.md

README.md

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 A program to manipulate SMF (Standard MIDI File) files. `midicomp` will
 both read and write SMF files in 0 or format 1 and also read and write
-it's own plain text format. This means a SMF file can be turned into
-easily parseble text, edited with any text editor or filtered through
+its own plain text format. This means a SMF file can be turned into
+easily parseable text, edited with any text editor or filtered through
 any script language, and "recompiled" back into a binary SMF file.
 
 * Copyright (C) 2003-2017 Mark Constable <[email protected]>