[MASK] appears in augmented sentences

[shaunlim0105]

This issue is related to #175 , but occurs when action= insert instead 'substitute'

To reproduce error,

text = 'It can be the first word of sentence which does not come with space.'
aug = naw.ContextualWordEmbsAug(
    model_path='bert-base-multilingual-cased', action="insert", top_p=0.9, aug_p=0.1)
augmented_text = aug.augment(text, n=4)

print("Word insert using LM:")
print(augmented_text)

giving out results as follows:

Word insert using LM:
['It can be the first word of sentence which does not come in with space.', 'It can be the whole first word of sentence which does not come with space.', 'It can [MASK] be the first word of sentence which does not come with space.', 'It can be the first word of sentence [MASK] which does not come with space.']

I'm using nlpaug version 1.1.1

[makcedward]

will fix it soon