CompatHelper: bump compat for Compat to 4, (keep existing compat) (#370)

* CompatHelper: bump compat for Compat to 4, (keep existing compat)

* Update Project.toml

Co-authored-by: CompatHelper Julia <compathelper_noreply@julialang.org>
Co-authored-by: David Widmann <devmotion@users.noreply.github.com>
Co-authored-by: Hong Ge <3279477+yebai@users.noreply.github.com>

Project.toml

@@ -3,7 +3,7 @@ uuid = "c7f686f2-ff18-58e9-bc7b-31028e88f75d"
 keywords = ["markov chain monte carlo", "probablistic programming"]
 license = "MIT"
 desc = "Chain types and utility functions for MCMC simulations."
-version = "5.3.1"
+version = "5.4.0"
 
 [deps]
 AbstractMCMC = "80f14c24-f653-4e6a-9b94-39d6b0f70001"
@@ -32,7 +32,7 @@ Tables = "bd369af6-aec1-5ad0-b16a-f7cc5008161c"
 [compat]
 AbstractMCMC = "0.4, 0.5, 1.0, 2.0, 3.0, 4"
 AxisArrays = "0.4.4"
-Compat = "2.2, 3"
+Compat = "2.2, 3, 4"
 Distributions = "0.21, 0.22, 0.23, 0.24, 0.25"
 Formatting = "0.4"
 IteratorInterfaceExtensions = "0.1.1, 1"