Update Flux compat

Author: vavrines

lib/OptimizationFlux/Project.toml

@@ -12,7 +12,7 @@ Reexport = "189a3867-3050-52da-a836-e630ba90ab69"
 
 [compat]
 julia = "1"
-Flux = "0.13"
+Flux = "0.13, 0.14"
 ProgressLogging = "0.1"
 Reexport = "1.2"
 Optimization = "3.15"