Log Message:
pkgin: Update to 0.13.0.

## Version 0.13.0 (2019-09-24)

 * "pkgin upgrade" now upgrades all packages instead of only keep \ 
packages, and
   essentially replaces "pkgin full-upgrade".  Selective upgrades have \ 
always
   been risky and provide no benefit, especially in light of refresh support.
   "pkgin full-upgrade" is retained for compatibility but marked as \ 
deprecated.
 * Refresh the local package repository when a forced update is requested, so
   that a failed update can be repaired easily.
 * Switch NetBSD default repository from ftp.netbsd.org to cdn.netbsd.org.