ChangeLog entry for Sphinx 1.7.4

Author: Martin Gallo

ChangeLog.md

@@ -6,6 +6,7 @@ v0.1.16 - 2018-XX-XX
 --------------------
 
 - Using Scapy version 2.4.0.
+- Using Sphinx 1.7.4 for documentation.
 - Added missing `pysap.utils` package in source/binary packages.
 - Use flake8 to find syntax errors and undefined names in Travis ([\#20](https://github.com/CoreSecurity/pysap/pull/20)) Thanks [@cclauss](https://github.com/cclauss)!
 - `pysap/SAPCAR.py`: Improved SAPCAR files parsing, adding proper structure names based on VSI documentation.