Merge tag 'v3.39.0' into develop

Added python 3.7 and armv6 test support and fixed stdout/stderr wrapping thanks to @ikonst v3.39.0

# gpg: Signature made Sun Dec 16 04:27:36 2018 CET
# gpg:                using RSA key 149325FD15904E9C4EB89E95E81444E9CE1F695D
# gpg: Good signature from "Rick van Hattem <wolph@wol.ph>" [ultimate]
# gpg:                 aka "[jpeg image of size 9662]" [ultimate]

Author: wolph