Commits
Uwe L. Korn authored and Wes McKinney committed 0c6b2d2ddeb
ARROW-4612: [Python] Use cython from PyPI for windows wheels build Crossbow builds: * https://ci.appveyor.com/project/xhochy/crossbow/builds/22453994 * https://ci.appveyor.com/project/xhochy/crossbow/builds/22453998 Author: Uwe L. Korn <uwelk@xhochy.com> Closes #3684 from xhochy/ARROW-4612 and squashes the following commits: ef3badf4 <Uwe L. Korn> Use newer pip version b1b8fa19 <Uwe L. Korn> Change cython pin to lower bound 82c2be04 <Uwe L. Korn> ARROW-4612: Use cython from PyPI for windows wheels build