env options property doesn't need to be passed to ProcessLauncher

lib/pipeline/pipeline.js

@@ -99,7 +99,6 @@ class Pipeline {
                   function runWebpack(next) {
                     let built = false;
                     const webpackProcess = new ProcessLauncher({
-                      env: self.env,
                       modulePath: utils.joinPath(__dirname, 'webpackProcess.js'),
                       logger: self.logger,
                       events: self.events,

lib/process/processLauncher.js

@@ -14,7 +14,6 @@ class ProcessLauncher {
    * @return {ProcessLauncher}    The ProcessLauncher instance
    */
   constructor(options) {
-    this.env = options.env;
     this.name = path.basename(options.modulePath);
     this.process = child_process.fork(options.modulePath);
     this.logger = options.logger;