Add the memoryview.release method (#3405)

Author: ntninja

stdlib/2/__builtin__.pyi

@@ -822,6 +822,9 @@ class memoryview(Sized, Container[_mv_container_type]):
     def tobytes(self) -> bytes: ...
     def tolist(self) -> List[int]: ...
 
+    if sys.version_info >= (3, 2):
+        def release(self) -> None: ...
+
     if sys.version_info >= (3, 5):
         def hex(self) -> str: ...
 

stdlib/2and3/builtins.pyi

@@ -822,6 +822,9 @@ class memoryview(Sized, Container[_mv_container_type]):
     def tobytes(self) -> bytes: ...
     def tolist(self) -> List[int]: ...
 
+    if sys.version_info >= (3, 2):
+        def release(self) -> None: ...
+
     if sys.version_info >= (3, 5):
         def hex(self) -> str: ...