Add goreleaser config (#107)

Notes for future self:

  - **To run a "local" release:** `goreleaser release --snapshot --clean`
  - **To check configuration file:** `goreleaser check`
  - **To create a new release:** `goreleaser release`

.gitignore

@@ -1 +1,5 @@
+# Cache
 /fields/v*.*.*/
+
+# goreleaser
+/dist/