remove extra line break before bulleted list

Author: rachelsaunders

rtdb-translate-text/PREINSTALL.md

@@ -29,7 +29,6 @@ This extension uses the Google Translate API for translations, which requires a
 #### Billing
 
 This extension uses other Firebase or Google Cloud Platform services which may have associated charges:
-
 - Cloud Translation API
 - Firebase Realtime Database
 - Cloud Functions