Fix #1488915, Multiple dots in relative import statement raise SyntaxError.
diff --git a/Grammar/Grammar b/Grammar/Grammar
index 8f248ef..c3709d2 100644
--- a/Grammar/Grammar
+++ b/Grammar/Grammar
@@ -62,7 +62,7 @@
raise_stmt: 'raise' [test [',' test [',' test]]]
import_stmt: import_name | import_from
import_name: 'import' dotted_as_names
-import_from: ('from' ('.'* dotted_name | '.')
+import_from: ('from' ('.'* dotted_name | '.'+)
'import' ('*' | '(' import_as_names ')' | import_as_names))
import_as_name: NAME [('as' | NAME) NAME]
dotted_as_name: dotted_name [('as' | NAME) NAME]