fix(release): update gorelaser config format

Wasn't noticed until now.

Author: Edholm

.goreleaser.yml

@@ -5,22 +5,15 @@ before:
 builds:
   - id: cantool
     binary: cantool
-    main: ./cmd/cantool/main.go
+    dir: ./cmd/cantool
+    main: main.go
     env:
       - CGO_ENABLED=0
     goos:
       - linux
       - windows
       - darwin
 
-archives:
-  - replacements:
-      darwin: Darwin
-      linux: Linux
-      windows: Windows
-      386: i386
-      amd64: x86_64
-
 checksum:
   name_template: "checksums.txt"