golangci-lint/CI: Bump versions and introduce new linters (#798)

* golangci-lint/CI: Bump versions

Fix remaining linter issues

* Specifically set AppVeyor version

* Fix the infamous typos 👀

* Add go env cmd to AppVeyor

* Add go version cmd to AppVeyor

* Specify AppVeyor image, adjust linters

* Update go get to go install due to deprecation

* Bump golangci-lint timeout time for AppVeyor

* Change NW contract to NQ

* Address nitters

* GetRandomPair -> Pair{}

* Address nits

* Address time nitterinos plus additional tweaks

* More time inception upgrades!

* Bending time and space

cmd/dbseed/dbseed_test.go

@@ -38,8 +38,7 @@ func TestLoad(t *testing.T) {
 	fs := &flag.FlagSet{}
 	fs.String("config", testConfig, "")
 	newCtx := cli.NewContext(testApp, fs, &cli.Context{})
-	err := load(newCtx)
-	if err != nil {
+	if err := load(newCtx); err != nil {
 		t.Fatal(err)
 	}
 }