chore: Set package name for go plugin. (#164)

## Summary

The go package needs a prefix to prevent future conflicts and also
handle the path.

## How did you test this change?

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## Are there any deployment considerations?

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Author: kinyoklion

release-please-config.json

@@ -18,6 +18,7 @@
 		},
 		"go": {
 			"release-type": "go",
+			"package-name": "go",
 			"tag-separator": "/",
 			"bump-minor-pre-major": true,
 			"versioning": "default",