fix typo (#65)

license_type.go

diff --git a/license_type.go b/license_type.go
index c63199e..893cd55 100644
--- a/license_type.go
+++ b/license_type.go
@@ -180,7 +180,7 @@
 	// Licenses Categorized by Type
 
 	// restricted - Licenses in this category require mandatory source
-	// distribution if we ships a product that includes third-party code
+	// distribution if we ship a product that includes third-party code
 	// protected by such a license.
 	restrictedType = sets.NewStringSet(
 		BCL,