add missing solidity decoder export

remix-debug/index.js

@@ -4,6 +4,8 @@ var EthDebugger = require('./src/Ethdebugger')
 var StorageViewer = require('./src/storage/storageViewer')
 var StorageResolver = require('./src/storage/storageResolver')
 
+var SolidityDecoder = require('./src/solidity-decoder')
+
 var remixLib = require('remix-lib')
 var BreakpointManager = remixLib.code.BreakpointManager
 
@@ -24,6 +26,7 @@ module.exports = {
    * @return {Function} _locationToRowConverter - function implemented by editor which return a column/line position for a char source location
    */
   BreakpointManager: BreakpointManager,
+  SolidityDecoder: SolidityDecoder,
   storage: {
     StorageViewer: StorageViewer,
     StorageResolver: StorageResolver