golangci-lint: megacheck has been replaced with gosimple, staticcheck…

…, and unused

Signed-off-by: Rickard von Essen <[email protected]>

.golangci.yml

@@ -107,16 +107,18 @@ linters-settings:
 
 linters:
   enable:
-    - megacheck
     - govet
     - gocyclo
     - gocritic
     - goconst
     - goimports
     - gofmt  # We enable this as well as goimports for its simplify mode.
+    - gosimple
     - prealloc
     - revive
+    - staticcheck
     - unconvert
+    - unused
     - misspell
     - nakedret