Fix warning

Author: ufechner7

src/_sysstate.jl

@@ -13,7 +13,7 @@ of tether particles.
 
 $(TYPEDFIELDS)
 """
-Base.@kwdef mutable struct SysState{P}
+@with_kw_noshow mutable struct SysState{P}
     "time since start of simulation [s]"
     time::Float64 = 0
     "time needed for one simulation timestep [s]"

src/build.jl

@@ -25,7 +25,7 @@ of tether particles.
 
 \$(TYPEDFIELDS)
 \"\"\"
-Base.@kwdef mutable struct SysState{P}"""
+@with_kw_noshow mutable struct SysState{P}"""
 FOOTER = "end"
 inputfile = joinpath("src", "sysstate.yaml")
 outputfile = joinpath("src", "_sysstate.jl")