Bump shapely from 1.7.0 to 1.7.1 in /requirements

[dependabot]

Bumps shapely from 1.7.0 to 1.7.1.

Changelog

Sourced from shapely's changelog.

1.7.1 (2020-08-20)

• STRtree now safely implements the pickle protocol (#915).
• Documentation has been added for minimum_clearance (#875, #874).
• In STRtree.__del__() we guard against calling GEOSSTRtree_destroy when the lgeos module has already been torn down on exit (#897, #830).
• Documentation for the overlaps() method has been corrected (#920).
• Correct the test in shapely.geometry.base.BaseGeometry.empty() to eliminate memory leaks like the one reported in #745.
• Get free() not from libc but from the processes global symbols (#891), fixing a bug that manifests on OS X 10.15 and 10.16.
• Extracting substrings from complex lines has been made more correct (#848, #849).
• Splitting of complex geometries has been sped up by preparing the input geometry (#871).
• Fix bug in concatenation of function argtypes (#866).
• Improved documentation of STRtree usage (#857).
• Improved handling for empty list or list of lists in GeoJSON coordinates (#852).
• The polylabel algorithm now accounts for polygon holes (#851, #817).

Commits

• edcb12a Version 1.7.1
• 0cd9184 Fix credits, add .mailmap
• 7f6f6d1 Update change log, credits, requirements
• 726f8cf Correct test in empty() (#969)
• e214bc0 Index error empty multilinestring (#949)
• d54e9ec Update CHANGES.txt
• d0c95c1 Fix segfault when using unpickled STRtree in another process (#915)
• 6f86501 Document set-like properties (#922)
• 7ba1224 Update docs re: WKT serialization (#921)
• db792c9 update overlaps docs to more closely match Wikipedia / JTS (#920)
• Additional commits viewable in compare view

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[dependabot]

Superseded by #115.