Update Project.toml

Author: HenriDeh

src/ReinforcementLearningZoo/Project.toml

@@ -29,7 +29,7 @@ LogExpFunctions = "0.3"
 NNlib = "0.8, 0.9"
 Optim = "1"
 ReinforcementLearningBase = "0.12"
-ReinforcementLearningCore = "0.5"
+ReinforcementLearningCore = "0.15"
 StatsBase = "0.33, 0.34"
 Zygote = "0.6"
 cuDNN = "1"