message: fix: small edits to chancelog
diff: This release brings several important bugfixes, improvements and new features.
  -In this version Nextclade adds support for the new SARS-CoV-2 variants. The default reference tree now contains a few nodes with clades `20A.EU1` and `20A.EU2`. For more information about the new variants refer to [Hodcroft et al., 2020](https://www.medrxiv.org/content/10.1101/2020.10.25.20219063v1).
  +In this version Nextclade adds support for the new SARS-CoV-2 regional subclades. The default reference tree now contains a few nodes with clades `20A.EU1` and `20A.EU2`. For more information about the new variants refer to [Hodcroft et al., 2020](https://www.medrxiv.org/content/10.1101/2020.10.25.20219063v1).
  -Nextclade algorithms now handle ambiguous nucleotides and gaps in the root sequence. Previously this was not needed, because our default root sequence is always full and unambiguous, but this is important now that Nextclade allows custom root sequences.
  +Nextclade algorithms now handle ambiguous nucleotides and gaps in the reference tree and the root sequence. Previously this was not needed, because our default root sequence is always full and unambiguous, but this is important now that Nextclade allows custom root sequences.
  Nextclade developers will no longer maintain `clades.json` file with a list of clades. Since v0.4.0, clade assignment is performed by taking clade of the nearest node on the reference tree, so the algorithm does not depend on this file. This change means that users no longer have to provide `clades.json` for custom viruses anymore, but also that the "Gene map" panel in the web application will not show markers for clade-defining mutations.
  