'Add an annotated segment. Operates inplace.
Parameters
onset : float
Annotation time onset from the beginning of the recording in
seconds.
duration : float
Duration of the annotation in seconds.
description : str
Description for the annotation. To reject epochs, use description
starting with keyword \'bad\''

def append(self, onset, duration, description):

    self.onset = np.append(self.onset, onset)
    self.duration = np.append(self.duration, duration)
    self.description = np.append(self.description, description)
