data variable reference bug

[icai]

https://github.com/zimmen/gulp-twig/blob/004763d9b581be9b6e13290a37622a891c9a1b80/index.js#L16

gulp.src(['./views/**/*.html'])
.pipe(twig({
            base: './views/',
            data: { tilte: 'sss'} // data
        }))

if I use the variable in one template, like this

{% set title = 'register' %}

ALL Template would be has data.title while equal to 'register'

https://www.npmjs.com/package/map-stream

change to

var data = file.data || Object.assign({}, options.data) || {};

[vastolf]

The fix for this in #45 is working, please take a look @zimmen

[bezoerb]

https://github.com/zimmen/gulp-twig/releases/tag/v1.2.0