Lint issue in gitlab-resize-image package

cmd/gitlab-resize-image/main.go:1:1: package-comments: should have a package comment (revive)
cmd/gitlab-resize-image/png/reader.go:1:1: package-comments: should have a package comment (revive)
cmd/gitlab-resize-image/png/reader.go:26:1: exported: exported function NewReader should have comment or be unexported (revive)
cmd/gitlab-resize-image/png/reader.go:78:17: var-declaration: should omit type []byte from declaration of var magicBytes; it will be inferred from the right-hand side (revive)