CompatHelper: bump compat for LsqFit to 0.15, (keep existing compat) (#79)

Co-authored-by: CompatHelper Julia <compathelper_noreply@julialang.org>

Author: github-actions[bot]

Project.toml

@@ -48,7 +48,7 @@ FileIO = "1.4"
 Interpolations = "0.12, 0.13, 0.14"
 JLD2 = "0.2, 0.3, 0.4"
 KernelFunctions = "0.9.7, 0.10"
-LsqFit = "0.11, 0.12, 0.13"
+LsqFit = "0.11, 0.12, 0.13, 0.15"
 MultivariateStats = "0.7, 0.8, 0.9, 0.10"
 NaNMath = "0.3, 1"
 Optim = "1"