CompatHelper: bump compat for Documenter to 1 for package test, (keep existing compat)

Author: CompatHelper Julia

test/Project.toml

@@ -26,7 +26,7 @@ UnicodePlots = "b8865327-cd53-5732-bb35-84acbb429228"
 AbstractMCMC = "2.2.1, 3.0, 4"
 DataFrames = "0.22.4, 1.0"
 Distributions = "0.24.12, 0.25"
-Documenter = "0.26, 0.27"
+Documenter = "0.26, 0.27, 1"
 FFTW = "1.1"
 IteratorInterfaceExtensions = "1"
 KernelDensity = "0.6.2"