Update Travis release token

Version 0.18.0

- Configure pdeathsignal (#114)
- Environment variable for -g (#101)

Bump version to 0.17.0

Bump version to 0.16.1

Bump version to 0.16.0

- New arches, thanks to @tianon!

Bump version to 0.15.0

Merge pull request #73 from krallin/32bits

Build i386 binary

Update docs to mention 32-bit build

Merge pull request #67 from krallin/fix-subreaper

Fix PR_SET_CHILD_SUBREAPER call

Merge pull request #65 from krallin/fix-tcsetpgrp-typos

Fix tcsetpgrp typos / Release 0.13.1