golangci: enable some more linters

They have not found anything and maybe we better not have them find anything
in the future. Commented ones can be useful in future, but find too many
problems at the moment.

.golangci.yml

@@ -42,12 +42,22 @@ linters:
 
     # extra linters
     # - exhaustive
+    # - goconst
+    # - goerr113
+    # - gomnd
+    # - nonamedreturns
+    # - unparam
+    - bidichk
     - bodyclose
     - contextcheck
+    - decorder
+    - durationcheck
     - errorlint
+    - exportloopref
     - gofmt
     - misspell
     - predeclared
+    - reassign
     - whitespace
     - goimports
   disable-all: true