Bump tensorflow from 1.4.0 to 1.12.2 in /EmoPy/docs

Bumps [tensorflow](https://github.com/tensorflow/tensorflow) from 1.4.0 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@v1.4.0...v1.12.2)

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Author: dependabot[bot]

EmoPy/docs/requirements.txt

@@ -6,7 +6,7 @@ scikit-image>=0.13.1
 scikit-learn>=0.19.1
 scikit-neuralnetwork>=0.7
 scipy>=0.19.1
-tensorflow==1.4.0
+tensorflow==1.12.2
 opencv-python
 h5py
 pydot