Log Message:
pkgin: Update to version 0.10.0 and take MAINTAINER.

## Version 0.10.0 (2018-05-17)

 * Add BUILD_DATE support, packages are now upgraded if the BUILD_DATE
   has changed, to ensure rebuilt dependencies are correctly handled.
 * Download handling fixes.
 * Count packages correctly.
 * Ensure the remote database is updated before performing upgrades.
 * Internal code cleanups, refactoring, WARNS fixes, etc.
 * Support nanosecond resolution on pkgdb mtime.
 * Sync progressmeter and pkg_install with upstreams.
 * Improve SQL logging.
 * Fix -d when used with an upgrade action.
 * Fix exit status for various commands and usage.
 * Avoid segfault in show-category.
 * Improve pkgin database initialisation and upgrade checks.
 * Support libarchive 2.x and Minix 3.3.0
 * Support PKG_INSTALL_DIR and PKGIN_DBDIR, primarily to support the
   new pkgin test suite: https://github.com/joyent/pkgin-test-suite