Update precompile_*.jl file

Author: aminya

deps/SnoopCompile/precompile/precompile_AcuteML.jl

@@ -11,6 +11,7 @@ function _precompile_()
     precompile(Tuple{typeof(AcuteML.multiString),Float64})
     precompile(Tuple{typeof(AcuteML.multiString),Int64})
     precompile(Tuple{typeof(AcuteML.multiString),String})
+    precompile(Tuple{typeof(addelm!),Document,String,Nothing,Type{AbsAttribute}})
     precompile(Tuple{typeof(addelm!),Node,String,Array{Any,1},Type{AbsNormal}})
     precompile(Tuple{typeof(addelm!),Node,String,Array{Float64,1},Type{AbsNormal}})
     precompile(Tuple{typeof(addelm!),Node,String,Array{Int64,1},Type{AbsNormal}})