Bump requirementslib from 1.5.9 to 1.5.13 in /backend

[dependabot-preview]

Bumps requirementslib from 1.5.9 to 1.5.13.

Changelog

Sourced from requirementslib's changelog.

1.5.13 (2020-08-12)

Bug Fixes

• Don't copy whole tree for local directory dependencies. #259

1.5.12 (2020-07-10)

Bug Fixes

• Fix a bug that assignments with type annotations are missing from the AST. #253
• Fix a bug that package_dir points to a wrong location when parsing setup.cfg. #255

1.5.11 (2020-06-01)

Bug Fixes

• Packages which use a function call in setup.py to find their own name dynamically will now successfully resolve. #251

1.5.10 (2020-06-01)

Bug Fixes

• Switch to BFS algorithm to iterate possible metadata directories. #186
• Fix a bug that + character in URL auth are converted to a space. #244
• Fixed an issue in the AST parser which caused failures when parsing setup.py files with assignments (e.g. variable = some_value) to the same name more than once, followed by operations on those variables (e.g. new_value = variable + other_variable). #246
• Copy symlinks as well for local path requirements. #248
• Fix a bug that non-string value for name argument will be taken as requirement name. #249

Commits

• c05332e Release 1.5.13
• 1e0120d Merge pull request #261 from sarugaku/bugfix/259
• 02b2a67 more robust monkeypatch
• 45a83ee Call build function with correct args
• fbc81e8 Update pip-shims version
• aebc270 Don't copy whole tree
• 9b05717 pre-bump
• 5805e02 Release 1.5.12
• a1b6a4d Merge pull request #256 from sarugaku/bugfix/254
• 18a51c4 correct the package_dir location
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #64.