CI: Bump go version, linters and fix minor issues (#1010)

* Bump golang, golangci-lint versions and fix issues

* Add -fno-stack-protector

* Fix AppVeyor golangci-lint ver

* Nitters

* Nitters round 2

gctscript/modules/ta/indicators/indicators_test.go

@@ -23,7 +23,7 @@ var (
 
 func TestMain(m *testing.M) {
 	for x := 0; x < 100; x++ {
-		v := rand.Float64() // nolint:gosec // no need to import crypo/rand for testing
+		v := rand.Float64() //nolint:gosec // no need to import crypo/rand for testing
 		candle := &objects.Array{}
 		candle.Value = append(candle.Value, &objects.Time{Value: time.Now()},
 			&objects.Float{Value: v},

gctscript/modules/wrapper_types.go

@@ -25,7 +25,7 @@ const (
 // Wrapper instance of GCT to use for modules
 var Wrapper GCTExchange
 
-// Exchange interface requirements
+// GCTExchange interface requirements
 type GCTExchange interface {
 	Exchanges(enabledOnly bool) []string
 	IsEnabled(exch string) bool

gctscript/wrappers/validator/validator.go

@@ -263,7 +263,7 @@ func (w Wrapper) OHLCV(ctx context.Context, exch string, p currency.Pair, a asse
 	})
 
 	for x := 1; x < 200; x++ {
-		r := validatorLow + rand.Float64()*(validatorHigh-validatorLow) // nolint:gosec // no need to import crypo/rand
+		r := validatorLow + rand.Float64()*(validatorHigh-validatorLow) //nolint:gosec // no need to import crypo/rand
 		candle := kline.Candle{
 			Time:   candles[x-1].Time.Add(-i.Duration()),
 			Open:   r,