Bump tensorflow from 1.11.0 to 1.12.2 in /Top Machine Learning Libraries

Bumps [tensorflow](https://github.com/tensorflow/tensorflow) from 1.11.0 to 1.12.2.
- [Release notes](https://github.com/tensorflow/tensorflow/releases)
- [Changelog](https://github.com/tensorflow/tensorflow/blob/master/RELEASE.md)
- [Commits](tensorflow/tensorflow@v1.11.0...v1.12.2)

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Author: dependabot[bot]

Top Machine Learning Libraries/requirements.txt

@@ -18,7 +18,7 @@ scikit-learn==0.20.0
 scipy==1.1.0
 six==1.11.0
 tensorboard==1.11.0
-tensorflow==1.11.0
+tensorflow==1.12.2
 termcolor==1.1.0
 Theano==1.0.3
 torch==0.4.1