avoid mutating defaults

Author: joshday

Project.toml

@@ -1,7 +1,7 @@
 name = "PlotlyLight"
 uuid = "ca7969ec-10b3-423e-8d99-40f33abb42bf"
 authors = ["joshday <emailjoshday@gmail.com>"]
-version = "0.4.3"
+version = "0.4.4"
 
 [deps]
 Artifacts = "56f22d72-fd6d-98f1-02f0-08ddc0907c33"

src/PlotlyLight.jl

@@ -106,8 +106,8 @@ end
 function Plot(traces, layout=Defaults.layout[], config=Defaults.config[]; kw...)
     data = traces isa Config ? [traces] : traces
     Plot(; kw..., data,
-        layout = merge!(layout, Defaults.layout[]),
-        config = merge!(config, Defaults.config[])
+        layout = merge(layout, Defaults.layout[]),
+        config = merge(config, Defaults.config[])
     )
 end