dephpend: Release Artifact: Can't check signature: No public key

I actually like to verify gpg keys. But looks like you did not provide a public key…

gpg --verify dephpend-0.6.0.phar.asc 
gpg: assuming signed data in 'dephpend-0.6.0.phar'
gpg: Signature made Do 11 Apr 2019 17:48:01 CEST
gpg:                using RSA key 22BD58D0E3B969122E5E1CF22BCCDC2E41A6C1AF
gpg:                issuer "haeuslmann@gmail.com"
gpg: Can't check signature: No public key