writeSignalTable: Add _classVersion in file.

Author: MartinOtter

src/SignalTableFunctions.jl

@@ -675,7 +675,8 @@ the corresponding signals are encoded.
 """
 function encodeSignalTable(signalTable; signalNames=nothing)
     if isSignalTable(signalTable)
-        jdict = OrderedDict{String,Any}("_class" => "SignalTable")
+        jdict = OrderedDict{String,Any}("_class" => "SignalTable",
+                                        "_classVersion" => version)
         if isnothing(signalNames)
             signalNames = getSignalNames(signalTable)
         end

src/SignalTables.jl

@@ -1,6 +1,7 @@
 module SignalTables
 
 const path = dirname(dirname(@__FILE__))
+const version = "0.3.1"   # version tag of SignalTables release without "v"
 
 using  OrderedCollections
 using  Unitful