CompatHelper: bump compat for Interpolations to 0.15, (keep existing compat)

Author: CompatHelper Julia

Project.toml

@@ -17,7 +17,7 @@ Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 [compat]
 CSV = "0.7, 0.8, 0.9.11, 0.10"
 DataFrames = "0.21, 0.22, 1.0, 1.1"
-Interpolations = "0.12, 0.13, 0.14"
+Interpolations = "0.12, 0.13, 0.14, 0.15"
 NaNMath = "0.3, 1"
 Query = "1.0"
 SpecialFunctions = "1.0, 1.1, 2"