get_trending_tags readme

hivemind/tavern/condenser_api_patterns/get_trending_tags/_readme.txt

+Lists tags sort by all payout, with stats summary of comments and top_posts.
+
+method: "condenser_api.get_trending_tags"
+params:
+{
+  "start_tag":"{tag}",
+
+     optional, point to tag; paging mechanism
+
+  "limit":{number},
+
+     optional range 1...250; default = 250
+}
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