Update ISSUE_TEMPLATE

PiperOrigin-RevId: 188564178

Author: Ryan Sepassi

ISSUE_TEMPLATE.md

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+<!-- **Note** Please tag your issue with *bug*, *feature request* or *help* -->
+
+### Description
+
+> …
+
+### *TensorFlow* and *tensor2tensor* versions
+
+<!-- **Note** Run `pip freeze | grep tensor` to get versions -->
+
+> …
+
+### In case of bug report: Steps to reproduce the problem
+
+> …
+
+### In case of bug report: Error log
+
+<!-- Please use code markdown (```) to format output messages. -->
+<!-- See https://help.github.com/articles/creating-and-highlighting-code-blocks/ -->
+
+> …