Add bash completion to release archives

Makefile

@@ -50,7 +50,7 @@ DIST_DIR = dist/v$(VERSION)
 crossbuild: CREDITS
 	rm -rf $(DIST_DIR)
 	env CGO_ENABLED=0 godzil crossbuild -build-ldflags=$(BUILD_LDFLAGS) \
-      -include='misc/zsh/_ghq' -z -d $(DIST_DIR)
+      -include='misc/bash/_ghq','misc/zsh/_ghq' -z -d $(DIST_DIR)
 	cd $(DIST_DIR) && shasum $$(find * -type f -maxdepth 0) > SHASUMS
 
 .PHONY: upload