CompatHelper: bump compat for "DataFrames" to "1.0"

Author: github-actions[bot]

Project.toml

@@ -18,7 +18,7 @@ Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [compat]
 CSV = "0.8"
-DataFrames = "0.22"
+DataFrames = "0.22, 1.0"
 Distributions = "0.24"
 JSON = "0.21"
 StanSample = "3.0"