build: Add extra linters.

Some of these cover points which have recently been highlighted in
reviews, such as contexts contained in structs, slices initialized with
zero length, and periods missing from the end of comments.

.golangci.yml

@@ -6,19 +6,28 @@ linters:
   enable:
     - asciicheck
     - bidichk
+    - containedctx
+    - dupword
     - durationcheck
     - errcheck
     - errchkjson
+    - errorlint
     - exhaustive
     - exportloopref
     - goconst
+    - godot
     - gofmt
     - goimports
     - gosimple
     - govet
     - ineffassign
+    - makezero
     - misspell
     - nilerr
+    - nosprintfhostport
+    - prealloc
+    - predeclared
+    - reassign
     - revive
     - staticcheck
     - tparallel