Fix linting.

typings/docplex/mp/constr.pyi

@@ -0,0 +1,15 @@
+from __future__ import annotations
+
+from docplex.mp.operand import LinearOperand
+
+class AbstractConstraint: ...
+class BinaryConstraint(AbstractConstraint): ...
+class LinearConstraint(BinaryConstraint, LinearOperand): ...
+class RangeConstraint(AbstractConstraint): ...
+class NotEqualConstraint(LinearConstraint): ...
+class LogicalConstraint(AbstractConstraint): ...
+class IndicatorConstraint(LogicalConstraint): ...
+class EquivalenceConstraint(LogicalConstraint): ...
+class IfThenConstraint(IndicatorConstraint): ...
+class QuadraticConstraint(BinaryConstraint): ...
+class PwlConstraint(AbstractConstraint): ...