Fix stray URL.

README.md

 * [Symfony Asset](https://github.com/symfony/asset) - Manages URL generation and versioning of web assets.
 * [Symfony Encore](https://github.com/symfony/webpack-encore) - A simple but powerful API for processing and compiling assets built around Webpack.
 
-https://github.com/symfony/webpack-encore
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 ### Geolocation
 *Libraries for geocoding addresses and working with latitudes and longitudes.*