(fix) satisfy the linter, and btw reduce timeout

searx/engines/jisho.py

@@ -3,7 +3,6 @@
 Jisho (the Japanese-English dictionary)
 """
 
-import json
 from urllib.parse import urlencode, urljoin
 
 # about

searx/settings.yml

@@ -801,7 +801,7 @@ engines:
   - name: jisho
     engine: jisho
     shortcut: js
-    timeout: 4.0
+    timeout: 3.0
     disabled: true
 
   - name: kickass