libpipeline 1.3.0: New formula for Linuxbrew

libpipeline is a C library for manipulating pipelines of subprocesses in a
flexible and convenient way.
libpipeline 1.3.1
man-db 2.6.7.1: New formula for Linuxbrew

man-db is an implementation of the standard Unix documentation system accessed
using the man command. It uses a Berkeley DB database in place of the
traditional flat-text whatis databases.