linter: Enable gofumpt and run against codebase (#1848)

* linter: Enable gofumpt and run against codebase

* Address shazbert's nits

* gofumpt: Fix issues after rebase

cmd/dbseed/database.go

@@ -13,9 +13,7 @@ import (
 	"github.com/urfave/cli/v2"
 )
 
-var (
-	dbConn *database.Instance
-)
+var dbConn *database.Instance
 
 func load(c *cli.Context) error {
 	var conf config.Config

cmd/dbseed/exchange.go

@@ -122,7 +122,6 @@ func addSingleExchange(c *cli.Context) error {
 	err = exchangeDB.Insert(exchangeDB.Details{
 		Name: exchangeName,
 	})
-
 	if err != nil {
 		return err
 	}