Support newer versions of Ruamel

Kerrick Staleyrequested to merge
kerrick1/buildstream:bump-ruamel into master

Description

Support newer version of the ruamel-yaml library.

Changes proposed in this merge request:

  • Fix one line of code that is incompatible with newer ruamel versions.
  • Bump ruamel-yaml requirement to >= 0.15.52 so that tests run with a newer ruamel version.

Note that the change is backwards-compatible, and versions of ruamel less than 0.15.52 will still work

This merge request, when approved, will close: #790 (closed)

Edited by Kerrick Staley

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