According document of 'What’s New In Python 3.7', 'async' are reserved keywords now.

Code in line 105 of 'odoo/addons/base/ir/ir_qweb/assetsbundle.py' 
`def to_html(self, sep=None, css=True, js=True, debug=False, async=False, url_for=(lambda url: url)):`
will throw SyntaxError out if we launch odoo with this update python.
""" This special 't-call' tag can be used in order to aggregate/minify javascript and css assets"""
        if len(el):
            raise SyntaxError("t-call-assets cannot contain children nodes")
        
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