Appveyor CI: Fix GitHub provider detection

#  - Accept UTF-8

#  - only guess github URLs

#  - stop using ANSI colors

#

# Modified by teor in 2018:

#  - fix github provider detection ('gitHub' or 'gitHubEnterprise', apparently)

# This program is free software; you can redistribute it and/or modify it under the

# terms of the GNU General Public License as published by the Free Software Foundation;

    BUILD_FMT = u'{url}/project/{account_name}/{project_name}/build/{build_version}'

    if vars["repo_provider"] == 'github':

    if vars["repo_provider"].lower().startswith('github'):

        COMMIT_FMT = u'https://{repo_provider}.com/{repo_name}/commit/{repo_commit}'

        vars.update(commit_url=COMMIT_FMT.format(**vars))