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

exchanges/gemini/gemini_mock_test.go

@@ -1,4 +1,5 @@
-//+build !mock_test_off
+//go:build !mock_test_off
+// +build !mock_test_off
 
 // This will build if build tag mock_test_off is not parsed and will try to mock
 // all tests in _test.go

exchanges/gemini/gemini_websocket.go

@@ -324,7 +324,7 @@ func (g *Gemini) wsHandleData(respRaw []byte) error {
 				Side:            oSide,
 				Status:          oStatus,
 				AssetType:       asset.Spot,
-				Date:            time.Unix(0, result[i].Timestampms*int64(time.Millisecond)),
+				Date:            time.UnixMilli(result[i].Timestampms),
 				Pair:            pair,
 			}
 		}