Fix msvc warning (#250)

Signed-off-by: Addisu Z. Taddese <[email protected]>

src/Manager.cc

@@ -381,7 +381,7 @@ ManagerPrivate::ManagerPrivate()
     const auto pid_seed = std::hash<std::thread::id>()(
         std::this_thread::get_id());
     std::seed_seq seed_value{time_seed, pid_seed};
-    std::vector<size_t> seeds(1);
+    std::vector<std::uint32_t> seeds(1);
     seed_value.generate(seeds.begin(), seeds.end());
     math::Rand::Seed(seeds[0]);
   }