Add TF 1.13.1 for macOS

Author: lakshayg

README.md

@@ -46,6 +46,7 @@ pip install --ignore-installed --upgrade "Download URL" --user
 | 1.12.0| CPU | Ubuntu 18.04      | 7.3 | 3.6.5  | FMA, AVX2, AVX512F              | [Download](https://github.com/lakshayg/tensorflow-build/releases/download/tf1.12.0-ubuntu18.04-py3-avx512f/tensorflow-1.12.0-cp36-cp36m-linux_x86_64.whl) |
 | 1.13.0 | CPU | Ubuntu 16.04     | 5.4 | 3.6.5  | FMA, AVX2, AVX512F              | [Download](https://github.com/lakshayg/tensorflow-build/releases/download/tf1.13.0-ubuntu16.04-py3-avx512f/tensorflow-1.12.0-cp35-cp35m-linux_x86_64.whl) |
 | 1.13.1 | CPU | Ubuntu 16.04     | 5.4 | 3.5.2  | FMA, AVX, AVX2, SSE4.1, SSE4.2  | [Download](https://github.com/lakshayg/tensorflow-build/releases/download/tf1.13.1-ubuntu16.04-py3/tensorflow-1.13.1-cp35-cp35m-linux_x86_64.whl) |
+| 1.13.1 | CPU | MacOS Mojave     | clang-1001.0.46.4 | 3.7.2  | FMA, AVX, AVX2, SSE4.1, SSE4.2  | [Download](https://github.com/lakshayg/tensorflow-build/releases/download/tf1.13.1-ubuntu16.04-py3/tensorflow-1.13.1-cp37-cp37m-macosx_10_9_x86_64.whl) |
 
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