Add golangci config

.golangci.toml

@@ -0,0 +1,27 @@
+[run]
+deadline = "5m"
+
+[linters]
+disable-all = true
+enable = [
+  "deadcode",
+  "goconst",
+  "gofmt",
+  "gosimple",
+  "goimports",
+  "ineffassign",
+  "scopelint",
+  "staticcheck",
+  "stylecheck",
+  "unconvert",
+  "unused",
+]
+
+[linter-settings]
+  [linter-settings.errcheck]
+  check-blank = true
+  check-type-assertions = true
+
+[issues]
+  max-same-issues = 50
+  max-issues-per-linter = 50

scan.go

@@ -226,7 +226,7 @@ func (sm *ScanManager) dueScanners() []string {
 
 	if age, err := wf.Cache.Age(cacheKey); err == nil {
 		if fi, err := os.Stat(configFile); err == nil {
-			if time.Now().Sub(fi.ModTime()) < age {
+			if time.Since(fi.ModTime()) < age {
 				log.Printf("[scan] config file has changed")
 				force = true
 			}