release of code-d 0.21.0 + serve-d 0.5.1

[uranuz]

Hello!
When code-d attempts self upgrade it prints the followinf output 
to console of VS Code:
"""
Installing DCD: DCD is outdated. Expected: 0.11.1, got none
Downloading from 
https://github.com/dlang-community/DCD/releases/download/v0.11.1/dcd-v0.11.1-linux-x86_64.tar.gz to /home/uranuz/.local/share/code-d/bin
Zip file already exists! Trying to install existing zip.
Extracting download...
> tar xvfz dcd-v0.11.1-linux-x86_64.tar.gz

gzip: stdin: not in gzip format
/bin/tar: Child returned status 1
/bin/tar: Error is not recoverable: exiting now
Successfully downloaded DCD, but could not find the executables.
Please open your user settings and insert the paths for 
dcd-client and dcd-server manually.
Download base location: /home/uranuz/.local/share/code-d/bin

Tried "dcd-client", "dcd-server", "bin/dcd-client", 
"bin/dcd-server"
Successfully installed DCD
"""

Looks like something went wrong with extracting archive: 
dcd-v0.11.1-linux-x86_64.tar.gz. This archive is not opening with 
standart Kubuntu GUI archiver like "Ark", but still I was able to 
"unzip" in through "unar" programme. Maybe you just archived it 
with some exotical settings of compression so it doesn't open 
everywhere.