ci: gofmt, golint => revive, update tools and actions (#87)

Fixes up the `make lint` target to also check
that all files are properly gofmt-ed,
replaces the deprecated `golint` check with `revive`,
and sets up dependabot to also update tools and actions regularly.

1 files changed, 2 insertions, 0 deletions

diff --git a/main.go b/main.go
index 9bd56e8..5d54071 100644
--- a/main.go
+++ b/main.go
@@ -1,3 +1,5 @@
+// sally is an HTTP service that allows you to serve
+// vanity import paths for your Go packages.
 package main // import "go.uber.org/sally"
 
 import (