fix syntax

app.py

@@ -105,13 +105,13 @@ neighbors = neighbors.merge(
     right = node_info,
     left_on = "gene_id_1",
     right_on = "gene_id",
-    suffix = "_1")
+    suffixes = c("", "_1"))
 
 neighbors = neighbors.merge(
     right = node_info,
     left_on = "gene_id_2",
     right_on = "gene_id",
-    suffix = "_2")
+    suffixes = ("", "_2"))
 
 ################################
 # Use NetworkX to layout graph #