Update change log

CHANGELOG.md

@@ -11,8 +11,19 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 
 ### Changed
 
+- Don't build tests if the standard CMake `BUILD_TESTING` variable is set to
+  off.
+- Now needs CMake 3.5.0 or greater.
+- Update included catch2 framework to current version v2.13.7.
+- Only enable clang-tidy make target if protobuf was found.
+- Allow setting C++ version to compile with in CMake config.
+
 ### Fixed
 
+- Fixes undefined behaviour in `float` and `double` byteswap.
+- Add missing includes of "config.hpp".
+- Avoid narrowing conversion by doing an explicit `static_cast`.
+
 
 ## [1.7.0] - 2020-06-08