CHANGELOG.md doesn't include all versions

Hi there,

I noticed that the CHANGELOG.md file includes only a few version numbers. For example the last releases documented in the file are 1.7.35, 1.7.38, 1.7.50.

At the time of writing the library is at version 1.7.52 and I was wandering why not all versions are included in the changelog. It becomes a bit difficult to understand what happened from one version to the other and it's also a bit misleading because one could expect to check the changelog to see what's the latest version.