Raise end-index by 1 when setting range-parts
Raise end-index by 1 when setting range-parts

This commit fixes a bug in Range, leading to the last line of a Range
not being able to be replaced via the __setitem__-function as the final
line setting its contents in the buffer the Range is based on assumes the
end-index to be inclusive, which it isn't in Python-slicing-notation.

meitham/python-client,Shougo/python-client,zchee/python-client,zchee/python-client,Shougo/python-client,neovim/python-client,meitham/python-client,neovim/python-client