Merge remote-tracking branch 'upstream/v3' into report-timestamp-to-status

* upstream/v3:
  v3.0.0-preview1
  Update v3 changelog
  Only have colored output on v3
  Add --color=false flag to disable colored output
  Update documentation about sprig
  Update CHANGELOG
  Migrate from sprig to slim-sprig
  Fix build after merging master
  Use colors for some output messages

go.sum

@@ -1,23 +1,19 @@
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@@ -29,6 +25,7 @@ github.com/radovskyb/watcher v1.0.5/go.mod h1:78okwvY5wPdzcb1UYnip1pvrZNIVEIh/Cm
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@@ -40,17 +37,8 @@ golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73r
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