Remove Githubpy notice.

Co-authored-by: Daniel Althviz Moré <d.althviz10@uniandes.edu.co>

NOTICE.txt

@@ -486,42 +486,6 @@ spyder/widgets/github/tests/test_github_backend.py
 
 
 
-Githubpy 1.1.1
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-Copyright 2014 Michael Liao (askxuefeng@gmail.com)
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-Author: Micheal Liao | askxuefeng@gmail.com | https://www.liaoxuefeng.com/
-Site: https://github.liaoxuefeng.com/githubpy/
-Source: https://github.com/michaelliao/githubpy
-License: Apache License Version 2.0
-https://www.apache.org/licenses/LICENSE-2.0
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-No modifications made.
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-githubpy is distributed under Apache License 2.0. Enjoy!
-
-
-Also included unmodified as part of QCrash, listed above.
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-See below for the full text of the Apache License Version 2.0.
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-The current Githubpy license can be viewed at:
-https://github.com/michaelliao/githubpy/blob/master/LICENSE.txt
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-Files covered:
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-spyder/utils/external/github.py
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-
 Sphinxify (from the Sage Project)
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