Exclude dot-files from being linted

This was matching `.go` files in my local `.git` folder.

Let's just exclude all hidden files.

Makefile

@@ -22,7 +22,7 @@ export PATH := $(GOBIN):$(PATH)
 export GOPROXY ?= https://proxy.golang.org
 export GO111MODULE=on
 
-LOCAL_GO_FILES = $(shell find . -type f -name '*.go' | grep -v -e /_ -e /testdata/)
+LOCAL_GO_FILES = $(shell find . -type f -name '*.go' | grep -v -e /_ -e /testdata/ -e '^\./\.')
 
 define message
 	@echo "### $(1)"

changelogs/unreleased/mk-fmt-no-dot-files.yml

+---
+title: Exclude dot-files from "make fmt" target
+merge_request: 641
+author:
+type: other