fix: $0 contains first arg in bundled electron apps (#1206)

yargs.js

@@ -42,12 +42,16 @@ function Yargs (processArgs, cwd, parentRequire) {
     return self
   }
 
-  self.$0 = process.argv
-    .slice(0, 2)
+  // ignore the node bin, specify this in your
+  // bin file with #!/usr/bin/env node
+  if (/\b(node|iojs|electron)(\.exe)?$/.test(process.argv[0])) {
+    self.$0 = process.argv.slice(1, 2)
+  } else {
+    self.$0 = process.argv.slice(0, 1)
+  }
+
+  self.$0 = self.$0
     .map((x, i) => {
-      // ignore the node bin, specify this in your
-      // bin file with #!/usr/bin/env node
-      if (i === 0 && /\b(node|iojs)(\.exe)?$/.test(x)) return
       const b = rebase(cwd, x)
       return x.match(/^(\/|([a-zA-Z]:)?\\)/) && b.length < x.length ? b : x
     })