core: correct type for client newline
core: correct type for client newline

junousia/SSHLibrary,jussimalinen/SSHLibrary,jussimalinen/SSHLibrary,junousia/SSHLibrary,garybehrend/robotframework-sshlibrary,garybehrend/robotframework-sshlibrary,haeygen/SSHLibrary,haeygen/SSHLibrary