add version constraints to opam file

verified-network-toolchain / petr4

Petr4: Formal Semantics for P4

Apache License 2.0

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Closed hackedy closed 2 years ago

hackedy commented 2 years ago

This is an issue for building the project on main

hackedy commented 2 years ago

This is OK to merge once p4pp v0.1.12 hits the OPAM repos