add spoiler tag

easier differentiation in consuming apps possible

set_info.yml

@@ -50,7 +50,7 @@
 #   mtgscardpath: "http://www.mtgsalvation.com/cards/amonkhet-invocations/"
 ---
 code: "GNT"
-name: "Game Night"
+name: "Game Night (Spoiler)"
 size: 300
 releaseDate: "2018-11-16"
 type: "box"
@@ -61,7 +61,7 @@ scryfallOnly: true
 noRSS: true
 ---
 code: "UMA"
-name: "Ultimate Masters"
+name: "Ultimate Masters (Spoiler)"
 size: 254
 releaseDate: "2018-12-07"
 type: "masters"
@@ -72,7 +72,7 @@ scryfallOnly: true
 noRSS: true
 ---
 code: "RNA"
-name: "Ravnica Allegiance"
+name: "Ravnica Allegiance (Spoiler)"
 size: 259
 releaseDate: "2019-01-25"
 type: "expansion"