Add 'text/x-styl': 'stylus' to the modeMap

[dmitrykiselyov]

Add 'text/x-styl': 'stylus' to the modeMap editor.js

        modeMap: {
            'text/html': 'html',
            'application/xml': 'xml',
            'text/xsl': 'xsl',
            'text/css': 'css',
            'text/x-less': 'less',
            'text/x-scss': 'scss',
            'text/x-sass': 'sass',
            'text/x-styl': 'stylus'
        },

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