CI/build: Update Go version, linters and fix minor issues (#1612)

* CI/build: Update Go version, linters and fix minor issues

* linters: Add intrange, copyloopvar, additional go vet linters to match gopls and fix issues

exchanges/bithumb/bithumb.go

@@ -708,14 +708,8 @@ func (b *Bithumb) FetchExchangeLimits(ctx context.Context) ([]order.MinMaxLevel,
 
 	limits := make([]order.MinMaxLevel, 0, len(ticks))
 	for code, data := range ticks {
-		c := currency.NewCode(code)
-		cp := currency.NewPair(c, currency.KRW)
-		if err != nil {
-			return nil, err
-		}
-
 		limits = append(limits, order.MinMaxLevel{
-			Pair:              cp,
+			Pair:              currency.NewPair(currency.NewCode(code), currency.KRW),
 			Asset:             asset.Spot,
 			MinimumBaseAmount: getAmountMinimum(data.ClosingPrice),
 		})

exchanges/bithumb/bithumb_test.go

@@ -643,8 +643,7 @@ func TestGetAmountMinimum(t *testing.T) {
 		},
 	}
 
-	for i := range testCases {
-		tt := &testCases[i]
+	for _, tt := range testCases {
 		t.Run(tt.name, func(t *testing.T) {
 			t.Parallel()
 			minAmount := getAmountMinimum(tt.unitprice)

exchanges/bithumb/bithumb_types.go

@@ -262,7 +262,7 @@ var WithdrawalFees = map[currency.Code]float64{
 	currency.LRC:   10,
 	currency.GTO:   15,
 	currency.STEEM: 0.01,
-	currency.STRAT: 0.2,
+	currency.STRAT: 0.2, //nolint:misspell // Not a misspelling
 	currency.PPT:   0.5,
 	currency.CTXC:  4,
 	currency.CMT:   20,

exchanges/bithumb/bithumb_ws_orderbook.go

@@ -195,7 +195,7 @@ func (b *Bithumb) setupOrderbookManager() {
 		}
 	}
 
-	for i := 0; i < maxWSOrderbookWorkers; i++ {
+	for range maxWSOrderbookWorkers {
 		// 10 workers for synchronising book
 		b.SynchroniseWebsocketOrderbook()
 	}