lintapp: use HTTPS protocol
lintapp: use HTTPS protocol

Change-Id: Ie8f47a410ab568ebcfb308db1c4fe060e1479614
Reviewed-on: https://go-review.googlesource.com/118576
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

golang/gddo,segmentio/gddo,golang/gddo,segmentio/gddo,segmentio/gddo,golang/gddo,golang/gddo,segmentio/gddo