Add support for RangeBoundary (#252)

django-stubs/contrib/postgres/fields/__init__.pyi

@@ -9,6 +9,7 @@ from .ranges import (
     DateRangeField as DateRangeField,
     DateTimeRangeField as DateTimeRangeField,
     RangeOperators as RangeOperators,
+    RangeBoundary as RangeBoundary,
 )
 from .hstore import HStoreField as HStoreField
 from .citext import (

django-stubs/contrib/postgres/fields/ranges.pyi

@@ -41,3 +41,8 @@ class RangeOperators:
     NOT_LT: str
     NOT_GT: str
     ADJACENT_TO: str
+
+class RangeBoundary(models.Expression):
+    lower: str
+    upper: str
+    def __init__(self, inclusive_lower: bool = ..., inclusive_upper: bool = ...): ...