TypeError when trying to copy a worksheet with a merged cell
*Created originally on Bitbucket by [steven somersbury (Liam Sanders)](https://bitbucket.org/%7B026e1b96-49c2-4f9b-96ab-4e2200c83817%7D/)* Fairly easy to reproduce, create a new workbook (or see attached) and merge a few cells then run the following code: ``` #!python from openpyxl import load_workbook wb = load_workbook("test.xlsx") ws = wb["Sheet1"] ws2 = wb.copy_worksheet(ws) wb.save("result.xlsx") ``` This gives the following error. ``` Traceback (most recent call last): File "copy_ws.py", line 5, in <module> ws2 = wb.copy_worksheet(ws) File "C:\Python\Python36-32\lib\site-packages\openpyxl\workbook\workbook.py", line 394, in copy_worksheet cp.copy_worksheet() File "C:\Python\Python36-32\lib\site-packages\openpyxl\worksheet\copier.py", line 43, in copy_worksheet self.target.merged_cells = copy(self.source.merged_cells) File "C:\Python\Python36-32\lib\copy.py", line 88, in copy return copier(x) File "C:\Python\Python36-32\lib\site-packages\openpyxl\worksheet\cell_range.py", line 456, in __copy__ n.ranges.append(copy(r)) File "C:\Python\Python36-32\lib\copy.py", line 88, in copy return copier(x) File "C:\Python\Python36-32\lib\site-packages\openpyxl\worksheet\cell_range.py", line 136, in __copy__ title=self.title) TypeError: __init__() got an unexpected keyword argument 'min_col' ``` *Attachments:* [test.xlsx](/uploads/21af3a1802a585cf9180c810b1f864b6/test.xlsx)
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