fastlane changelogs too long

``` com.jerboa/metadata/en-US/changelogs/80.txt has 926 chars com.jerboa/metadata/en-US/changelogs/84.txt has 1302 chars ``` fastlane's limit for changelogs is 500 chars, everything beyond that position is simply cut off (even mid-word). It's fine to include a link to the full changelog at their end – but simply summing up all commit messages in the changelogs is… well, not doing the job (with the last one, 80% were only relevant to the app developers even 🙈). Can you please take care to stay within those limits with future releases? I've just manually cleaned-up the last log at our end, so the relevant things are still being shown. Thanks in advance!