English typo in merge.py

[AndreaPi]

Describe the bug
English typo on line 25 of merge.py

cocohelper/src/cocohelper/merge.py

Line 25 in 2af95b7

raise ValueError("Thi minimum number of coco helpers that can be merged is 2. Please feed two or more "

:

To Reproduce
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Expected behavior

    if len(coco_helpers) < 2:
        raise ValueError("The minimum number of coco helpers that can be merged is 2. Please feed two or more "
                         "COCOHelper objects.")

Screenshots
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Desktop (please complete the following information):
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