Prep for 0.13.0 release
Prep for 0.13.0 release

[ci skip]

twbs/bootlint,chrismbarr/bootlint,twbs/bootlint,2947721120/ubiquitous-octo-kumquat,freezy-sk/bootlint,2947721120/ubiquitous-octo-kumquat,freezy-sk/bootlint,2947721120/ubiquitous-octo-kumquat,chrismbarr/bootlint,freezy-sk/bootlint,chrismbarr/bootlint