relax Polynomials req

Author: eford

Project.toml

@@ -61,7 +61,7 @@ MD5 = "0.2"
 Missings = "0.4, 1"
 MultivariateStats = "0.8, 0.9, 0.10"
 Plots = "1"
-Polynomials = "4"
+Polynomials = "3, 4"
 Query = "1"
 RvSpectML = "0.2.7"
 RvSpectMLBase = "0.2.3"