Document Point(..) constructor change no longer allowing coordinate sequence of len > 1

[jorisvandenbossche]

See #1590 (comment) for context

With shapely 1.8:

In [1]: from shapely.geometry import Point

In [2]: Point([(1, 2), (3, 4), (5, 6)]).wkt
Out[2]: 'POINT (1 2)'

One 2.x, this raises an error instead of ignoring the other coordinates. This PR adds an explicit test for this and a note in the release notes.

[coveralls]

Pull Request Test Coverage Report for Build 3459367734

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.04%) to 84.791%

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Totals
Change from base Build 3445349921:	0.04%
Covered Lines:	2191
Relevant Lines:	2584

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💛 - Coveralls