master
Trim trailing white space throughout the project
fix collections abc import for py38
Merge branch 'newdict-fix' of https://github.com/MitalAshok/python-future into MitalAshok-newdict-fix
Fix pow() with negative newint (issue #568)
Docs (mostly): Update references to future.builtins -> builtins
Merge pull request #337 from Anthchirp/master
Fix typos