Fix double quote autoclosing issue with docstring quotes.

Author: vpetrovykh

settings/sublime/Default.sublime-keymap

@@ -5,7 +5,7 @@
             { "key": "setting.auto_match_enabled", "operator": "equal", "operand": true },
             { "key": "selection_empty", "operator": "equal", "operand": true, "match_all": true },
             { "key": "following_text", "operator": "regex_contains", "operand": "^(?:\t| |\\)|]|\\}|>|$)", "match_all": true },
-            { "key": "preceding_text", "operator": "regex_contains", "operand": "(?:[bfruBFRU]|[^'[:alnum:]_])$", "match_all": true },
+            { "key": "preceding_text", "operator": "regex_contains", "operand": "(?:[bfruBFRU]|[^\"[:alnum:]_])$", "match_all": true },
             { "key": "eol_selector", "operator": "not_equal", "operand": "string.quoted.double - punctuation.definition.string.end", "match_all": true },
             { "key": "eol_selector", "operator": "equal", "operand": "source.python", "match_all": true }
         ]