v0.2.3

• update vendor dependencies
• add windows build

$ sha1sum skeg_*
4f21b7691a36c92d90e4b3445b2997ff397ed0d0 skeg_darwin_amd64
f9497db5360445e243f38091e10eb81697dd3376 skeg_linux_amd64
5e12f794237ce5c67af4ebd902d8f2c01f4f7a11 skeg_windows_amd64.exe
$ sha256sum skeg_*
7d0f37d720991ef2baf6592047df0a99cc88153e83485c006410907bce666bdf skeg_darwin_amd64
349ec1fcaae7acc7ce756f46a40bc58af323b7c64cae52e6650f12b2608c05b9 skeg_linux_amd64
ae69edf157d524eea28275d4d056ebb4cff0446145e4f894ae8f54093644368c skeg_windows_amd64.exe
$ md5sum skeg_*
621163d9e6f9d1b68d81adbea85185fa skeg_darwin_amd64
946cde76aa7f64878836e782c79615cf skeg_linux_amd64
df6e5ebd8e53e301e5ed83ab1ace6f1a skeg_windows_amd64.exe