add backtick to remove_quotes character list

Author: codenamelxl

sqlparse/utils.py

@@ -55,7 +55,7 @@ def remove_quotes(val):
     """Helper that removes surrounding quotes from strings."""
     if val is None:
         return
-    if val[0] in ('"', "'") and val[0] == val[-1]:
+    if val[0] in ('"', "'", '`') and val[0] == val[-1]:
         val = val[1:-1]
     return val