gddo/database: fix malformed json struct tag

Fixes #453

Change-Id: Id9ad9fd7b84fb7847e6353bb5fd7977a8b661bb4
Reviewed-on: https://go-review.googlesource.com/32829
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/database/database.go b/database/database.go
index 9f721a5..7a52ae8 100644
--- a/database/database.go
+++ b/database/database.go
@@ -67,7 +67,7 @@
 type Package struct {
 	Name        string  `json:"name,omitempty"`
 	Path        string  `json:"path"`
-	ImportCount int     `json:"import_count`
+	ImportCount int     `json:"import_count"`
 	Synopsis    string  `json:"synopsis,omitempty"`
 	Fork        bool    `json:"fork,omitempty"`
 	Stars       int     `json:"stars,omitempty"`