def url2raw(url):
    """Convert from Github URL to Raw URL.

    Args:
        url (str) : Github URL.

    Examples:
        >>> from pycharmers.utils import pycat, download_file
        >>> from pycharmers.sdk import url2raw
        >>> github_url = "https://github.com/opencv/opencv/blob/master/data/CMakeLists.txt"
        >>> path = download_file(url=github_url, dirname=".")
        >>> pycat(path, head=10)
        <!DOCTYPE html>
        <html lang="en">
        <head>
            <meta charset="utf-8">
        <link rel="dns-prefetch" href="https://github.githubassets.com">
        # The above file is HTML!!
        # Therefore, convert from Github URL to Raw URL.
        >>> raw_url = url2raw(github_url)
        >>> path = download_file(url=raw_url, dirname=".")
        >>> pycat(path, head=2)
        file(GLOB HAAR_CASCADES haarcascades/*.xml)
        file(GLOB LBP_CASCADES lbpcascades/*.xml)
        # Get the desired data :)    
    """
    return url.replace("://github.com/", "://raw.githubusercontent.com/").replace("/blob/", "/")