fixed assignment class unique values list initialization error on lin…

…e 14

locidex/classes/assignment.py

@@ -11,7 +11,7 @@ def __init__(self, df,query_id_col,loci_metadata):
         self.df = df
         self.columns = df.columns.tolist()
         self.loci_metadata = loci_metadata
-        self.queries = df[query_id_col].unique.tolist()
+        self.queries = df[query_id_col].unique().tolist()