Fix ESLint error.
Fix ESLint error.

kkirsche/bootlint,twbs/bootlint,evilemon/bootlint,angeliaz/bootlint,cnbin/bootlint,2947721120/ubiquitous-octo-kumquat,freezy-sk/bootlint,iamphill/bootlint,evilemon/bootlint,kkirsche/bootlint,chrismbarr/bootlint,twbs/bootlint,fellipecouto96/bootlint,angeliaz/bootlint,chrismbarr/bootlint,zacechola/bootlint,chrismbarr/bootlint,techkrish/bootlint,fellipecouto96/bootlint,cnbin/bootlint,iamphill/bootlint,freezy-sk/bootlint,2947721120/ubiquitous-octo-kumquat,angeliaz/bootlint,zacechola/bootlint,techkrish/bootlint,techkrish/bootlint,fellipecouto96/bootlint,zacechola/bootlint,iamphill/bootlint,kkirsche/bootlint,cnbin/bootlint,evilemon/bootlint,2947721120/ubiquitous-octo-kumquat,freezy-sk/bootlint