CompatHelper: bump compat for AdvancedHMC to 0.8 for package docs, (keep existing compat)

Author: CompatHelper Julia

docs/Project.toml

@@ -58,7 +58,7 @@ Unitful = "1986cc42-f94f-5a68-af5c-568840ba703d"
 Zygote = "e88e6eb3-aa80-5325-afca-941959d7151f"
 
 [compat]
-AdvancedHMC = "0.6, 0.7"
+AdvancedHMC = "0.6, 0.7, 0.8"
 BenchmarkTools = "1"
 CSV = "0.10"
 CUDA = "5"