Duplicate version in CHANGELOG.md

[regseb]

Is your feature request related to a problem? Please describe.
Since 0.15.2, the changes of the releases are inserted in duplicate in CHANGELOG.md:

• chore(release): 0.15.2 [skip ci]
• chore(release): 0.16.0 [skip ci]

Describe the solution you'd like
Add only once the changes for future versions. And remove duplicates for versions 0.15.2 and 0.16.0.

[regseb]

@coliff @thedaviddias Version 0.16.1 are added in duplicate: ec2da2c#diff-06572a96a58dc510037d5efa622f9bec8519bc1beab13c9f251e97e657a9d4ed

[coliff]

yep, I made a new PR for it.. thanks!