Bump tensorflow from 1.15.0 to 2.4.0

Bumps [tensorflow](https://github.com/tensorflow/tensorflow) from 1.15.0 to 2.4.0.
- [Release notes](https://github.com/tensorflow/tensorflow/releases)
- [Changelog](https://github.com/tensorflow/tensorflow/blob/master/RELEASE.md)
- [Commits](tensorflow/tensorflow@v1.15.0...v2.4.0)

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Author: dependabot[bot]

setup.py

@@ -36,7 +36,7 @@
 	author_email='martin_engqvist@hotmail.com',
 	url='https://github.com/EngqvistLab/UniRep',
         packages=find_packages(exclude=['contrib', 'docs', 'tests*']), #find folders containing scripts, exclude irrelevant ones
-        install_requires=['tensorflow==1.15.0', 'numpy==1.18.1', 'pandas==1.0.1', 'biopython==1.76'],
+        install_requires=['tensorflow==2.4.0', 'numpy==1.18.1', 'pandas==1.0.1', 'biopython==1.76'],
         include_package_data=True,
 	license='GPLv3+',
 	classifiers=[