Autofix lint when we can (#99)

## Summary:
This is mostly useful for gofumpt, although a few other linters may
support it.  Anyway, we may as well.

## Test plan:
make lint


Author: benjaminjkraft

Reviewers: dnerdy, StevenACoffman

Required Reviewers: 

Approved By: dnerdy, StevenACoffman

Checks: ✅ Test (1.17), ✅ Test (1.16), ✅ Test (1.15), ✅ Test (1.14), ✅ Lint, ✅ Test (1.17), ✅ Test (1.16), ✅ Test (1.15), ✅ Test (1.14), ✅ Lint

Pull Request URL: #99

Author: benjaminjkraft

Makefile

@@ -4,7 +4,7 @@ example:
 
 lint:
 	( cd internal/lint && go build -o golangci-lint github.com/golangci/golangci-lint/cmd/golangci-lint )
-	internal/lint/golangci-lint run ./...
+	internal/lint/golangci-lint run ./... --fix
 
 check: lint
 	go test -cover ./...