Generates a new file hash remains the same

[chenlong3]

Description

Steps to reproduce

gulp.task('angular-min',function(){
gulp.src(['./module/app.js','./module/_js/*.js','./module/*/service.js','./module/*/factory.js'])
    .pipe(ngAnnotate())
    .pipe(ngMin({dynamic:false}))
    .pipe(stripDebug())  //console
    .pipe(concat('my.min.js'))
    .pipe(rev())
    .pipe(uglify({outSourceMap:false,mangle:{except: ['$ocLazyLoad']}}))
    .pipe(gulp.dest('./dist'))
    .pipe(rev.manifest())                                   //- 生成一个rev-manifest.json
    .pipe(gulp.dest('./rev/js'));

});

[Sindre Sorhus]

https://github.com/sindresorhus/gulp-rev#different-hash-for-unchanged-files