BUG: fix data.py regression
BUG: Fixed non-unique indexing memory allocation issue with .ix/.loc (GH4280)
Merge pull request #4283 from jreback/index_mem

BUG: Fixed non-unique indexing memory allocation issue with .ix/.loc (GH4280)
Merge pull request #4281 from cpcloud/data-py-regression-fix

BUG: fix data.py regression
TST: ujson dont force endianness #4274
Merge pull request #4284 from Komnomnomnom/ujson-tst-endianness

TST: ujson dont force endianness #4274
Update CONTRIBUTING.md with note on attribution in PRs
DOC: Fix typo.
Merge pull request #4285 from y-p/PR_CONTRIBUTING

Update CONTRIBUTING.md with note on attribution in PRs
Merge pull request #4286 from jseabold/fix-typo

DOC: Fix typo.
TST: print out byteorder in ci/print_versions.py