lint: explicitly configure golangci-lint excludes

Updates #9

.golangci.yml

@@ -26,3 +26,11 @@ linters-settings:
     packages:
       - github.com/mmcloughlin/avo
       - golang.org/x/
+
+issues:
+  exclude-use-default: false
+  exclude:
+    # errcheck: Almost all programs ignore errors on these functions and in most cases it's ok
+    - Error return value of .((os\.)?std(out|err)\..*|.*Close|.*Flush|os\.Remove(All)?|.*printf?|os\.(Un)?Setenv). is not checked
+    # golint: Annoying issue about not having a comment. The rare codebase has such comments
+    - (comment on exported (method|function|type|const)|should have( a package)? comment|comment should be of the form)