Update params

experiments/parameters.json

 {
-  "max_sub": 12,
-  "word_change_size": 0.4,
-  "similarity_bound": 0.95,
+  "max_sub": 6,
+  "word_change_size": 0.45,
+  "similarity_bound": 0.9,
   "word_synonym_threshold": 0.65,
   "lang": {
       "enron_spam": "en",