Merge branch 'mix_sem_ver_version_fix' into 'develop'

Fixed mix version computed for underscore-containing branches

See merge request pleroma/pleroma!1314

mix.exs

@@ -213,7 +213,7 @@ defp version(version) do
            true <- branch_name != "master" do
         branch_name =
           String.trim(branch_name)
-          |> String.replace(~r/\W+/, "-")
+          |> String.replace(~r/[^0-9a-z\-\.]+/i, "-")
 
         "-" <> branch_name
       end