FileIO bugs

[jlsneto]

• Version: 1.5.4
• Platform: all
• Subsystem: file

import cereja as cj

# Bug 1
file = cj.FileIO.create('./test.txt')
file[0] = 'line1'
file[1] = 'line2' # Raise exception IndexError: list assignment index out of range

# Bug 2
print(file.path) # /test.txt
file.set_path('./test2.txt')
file.undo() # isn't reset path altered
print(file.path) # /test2.txt