Fix deprecations: electron-packager cb->promise, mocha compilers->require

gulp/tests/mocha.js

@@ -13,7 +13,7 @@ gulp.task('mocha', (done) => {
     .pipe(istanbul.hookRequire()) // Force `require` to return covered files
     .on('finish', () => gulp.src(PATHS.TEST_SRC, { read: false })
       .pipe(mocha({
-        compilers: 'js:babel-core/register',
+        require: 'babel-core/register',
         recursive: true,
       }))
       .pipe(istanbul.writeReports({

src/build/buildMain.js

@@ -202,13 +202,15 @@ function buildMain(inpOptions, callback) {
 
       packagerConsole.override();
 
-      packager(packageOptions, (error, appPathArray) => {
-        // restore console.error
-        packagerConsole.restore();
-
-        // pass options which still contains the icon to waterfall
-        cb(error, opts, appPathArray);
-      });
+      packager(packageOptions)
+        .then(appPathArray => {
+          packagerConsole.restore(); // restore console.error
+          cb(null, opts, appPathArray); // options still contain the icon to waterfall
+        })
+        .catch(error => {
+          packagerConsole.restore(); // restore console.error
+          cb(error, opts); // options still contain the icon to waterfall
+        });
     },
     (opts, appPathArray, cb) => {
       progress.tick('finalizing');