Use inspect.getfullargspec() function because inspect.getargspec() is deprecated

bottle_sqlite.py

@@ -104,7 +104,7 @@ class SQLitePlugin(object):
 
         # Test if the original callback accepts a 'db' keyword.
         # Ignore it if it does not need a database handle.
-        argspec = inspect.getargspec(_callback)
+        argspec = inspect.getfullargspec(_callback)
         if keyword not in argspec.args:
             return callback