message: gitian: add jonatack gpg key fingerprint
diff: @@ -13,6 +13,7 @@ D35176BE9264832E4ACA8986BF0792FBE95DC863 fivepiece
  01CDF4627A3B88AAE4A571C87588242FBE38D3A8 Gavin Andresen
  D1DBF2C4B96F2DEBF4C16654410108112E7EA81F Hennadii Stepanov (hebasto)
  D3CC177286005BB8FF673294C5242A1AB3936517 jl2012
  +82921A4B88FD454B7EB8CE3C796C4109063D4EAF Jon Atack
  32EE5C4C3FA15CCADB46ABE529D4BCB6416F53EC Jonas Schnelli
  4B4E840451149DD7FB0D633477DFAB5C3108B9A8 Jorge Timon
  C42AFF7C61B3E44A1454CD3557AF762DB3353322 Karl-Johan Alm (kallewoof)
  