Liquid 20200205 follow upstream master#3

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nasjp wants to merge 7 commits intoliquidfrom

liquid_20200205_follow_upstream_master

Commits on Aug 29, 2019

all: add go version to go.mod
Bryan C. Mills
committed
message/pipeline: skip test if the 'go' executable is not found
Bryan C. Mills
committed

Commits on Oct 31, 2019

all: upgrade to Unicode 12
mpvl
committed

Commits on Nov 22, 2019

message/pipeline: avoid writing to the testdata directory
Bryan C. Mills
committed
message/pipeline: sort maps to generate predictable output

rozmansi
authored and
zx2c4
committed

Commits on Dec 30, 2019

message/pipeline: detect unknown keys

rozmansi
authored and
mpvl
committed

Commits on Feb 5, 2020

:+1: Merge upstream master
nas
committed