Bump requirementslib from 1.5.9 to 1.5.10 in /backend

[dependabot-preview]

Bumps requirementslib from 1.5.9 to 1.5.10.

Changelog

Sourced from requirementslib's changelog.

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

• 0cc3380 Release 1.5.10
• 4c27520 Merge pull request #250 from sarugaku/bugfix/249
• c7f0cdb add test cases
• 26e75ba Merge branch 'master' into bugfix/249
• dfe951e Merge pull request #187 from sarugaku/bugfix/186-iter-metadata
• 939a34b don't accept non-string values for name parsing
• 94b2eac Merge branch 'master' into bugfix/186-iter-metadata
• 2d07c8d Merge pull request #248 from sarugaku/bugfix/copytree
• 5f608fe add news entries for #248 and #244
• a09380f py27 doesn't support last argument
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #26.