Add a note regarding error codes
Add a note regarding error codes

amuehlem/misp-modules,MISP/misp-modules,VirusTotal/misp-modules,Rafiot/misp-modules,Rafiot/misp-modules,MISP/misp-modules,VirusTotal/misp-modules,amuehlem/misp-modules,VirusTotal/misp-modules,MISP/misp-modules,Rafiot/misp-modules,amuehlem/misp-modules