pig: 0.14.0 -> 0.16.0

Semi-automatic update. These checks were done:

- built on NixOS
- ran `/nix/store/vfr6b50xzj4rj0xhl83vfqqq127lx79s-pig-0.16.0/bin/pig --help` got 0 exit code
- ran `/nix/store/vfr6b50xzj4rj0xhl83vfqqq127lx79s-pig-0.16.0/bin/pig --version` and found version 0.16.0
- ran `/nix/store/vfr6b50xzj4rj0xhl83vfqqq127lx79s-pig-0.16.0/bin/pig -h` and found version 0.16.0
- found 0.16.0 with grep in /nix/store/vfr6b50xzj4rj0xhl83vfqqq127lx79s-pig-0.16.0