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/exchange_wrapper_issues/main.go

@@ -951,12 +951,10 @@ func outputToConsole(exchangeResponses []ExchangeResponses) {
 // disruptFormatting adds in an unused delimiter and strange casing features to
 // ensure format currency pair is used throughout the code base.
 func disruptFormatting(p currency.Pair) (currency.Pair, error) {
-	base := p.Base.String()
-	if base == "" {
+	if p.Base.IsEmpty() {
 		return currency.Pair{}, errors.New("cannot disrupt formatting as base is not populated")
 	}
-	quote := p.Quote.String()
-	if quote == "" {
+	if p.Quote.IsEmpty() {
 		return currency.Pair{}, errors.New("cannot disrupt formatting as quote is not populated")
 	}