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

Author: CompatHelper Julia

Project.toml

@@ -21,7 +21,7 @@ StatsBase = "2913bbd2-ae8a-5f71-8c99-4fb6c76f3a91"
 CSV = "0.7, 0.8, 0.9.11, 0.10"
 DataFrames = "0.21, 0.22, 1.0, 1.1"
 FITSIO = "0.16, 0.17"
-Interpolations = "0.12, 0.13, 0.14"
+Interpolations = "0.12, 0.13, 0.14, 0.15"
 Missings = "0.4.5, 1.0"
 NaNMath = "0.3.5, 1"
 Polynomials = "1.2, 2, 3, 4"