sync golangci config with restic

.golangci.yml

@@ -10,13 +10,10 @@ linters:
     # make sure all errors returned by functions are handled
     - errcheck
 
-    # find unused code
-    - deadcode
-
     # show how code can be simplified
     - gosimple
 
-    # # make sure code is formatted
+    # make sure code is formatted
     - gofmt
 
     # examine code and report suspicious constructs, such as Printf calls whose
@@ -35,15 +32,14 @@ linters:
     # find unused variables, functions, structs, types, etc.
     - unused
 
-    # find unused struct fields
-    - structcheck
-
-    # find unused global variables
-    - varcheck
-
     # parse and typecheck code
     - typecheck
 
+    # ensure that http response bodies are closed
+    - bodyclose
+
+    - importas
+
 issues:
   # don't use the default exclude rules, this hides (among others) ignored
   # errors from Close() calls
@@ -55,3 +51,6 @@ issues:
     - exported (function|method|var|type|const) .* should have comment or be unexported
     # revive: ignore constants in all caps
     - don't use ALL_CAPS in Go names; use CamelCase
+    # revive: lots of packages don't have such a comment
+    - "package-comments: should have a package comment"
+    - "redefines-builtin-id:"