CompatHelper: add new compat entry for "Unitful" at version "1.1"

Author: github-actions[bot]

Project.toml

@@ -30,6 +30,7 @@ NaNMath = "0.3"
 SpecialFunctions = "0.7, 0.8, 0.9, 0.10"
 StaticArrays = "0.10, 0.11, 0.12"
 TreeViews = "0.3"
+Unitful = "1.1"
 julia = "1.2"
 
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