Fix debug in production webpack (same change made on dweb-transports dweb-objects and dweb-archive)

package.json

@@ -49,5 +49,5 @@
     "test": "cd src; node ./test.js",
     "help": "echo 'test (test it)'; echo 'build (creates dweb-transports-bundle)'"
   },
-  "version": "0.1.12"
+  "version": "0.1.13"
 }

webpack.config.js

@@ -25,13 +25,18 @@ module.exports = {
             zlib: 'browserify-zlib-next'
         }
     },
-    plugins: [
+    optimization: {
+        minimizer: [
             new UglifyJsPlugin({
                 uglifyOptions: {
                     compress: {
-                    unused: false
+                        unused: false,
+                        collapse_vars: false // debug has a problem in production without this.
                     }
+
+                    //compress: false
                 }
             })
         ]
+    }
 }