title: can't connect to github via ssh
body: <p>I tried to clone one of my repositories on github from my newly installed linux machine running manjaro with fluxbox. i set up the user.name and user.email and uploaded the correct ssh key. but i always get</p>
  
  <pre><code>The authenticity of host 'github.com (192.30.252.129)' can't be established.
  RSA key fingerprint is SHA256:nThbg6kXUpJWGl7E1IGOCspRomTxdCARLviKw6E5SY8.
  Are you sure you want to continue connecting (yes/no)? 
  Host key verification failed.
  fatal: Could not read from remote repository.
  
  Please make sure you have the correct access rights and the repository exists.
  </code></pre>
  
  <p>I googled it and found that i should do <code>ssh-keygen -R github.com</code> which should delete github from my known_hosts file but the known_hosts file doesn't even exist yet, because i just finished setting up a new linux install.</p>
  
  <p>so i tried <code>ssh -vT git@github</code> which gave me</p>
  
  <pre><code>ssh -vT git@github.com
  OpenSSH_7.1p1, OpenSSL 1.0.2d 9 Jul 2015
  debug1: Reading configuration data /etc/ssh/ssh_config
  debug1: Connecting to github.com [192.30.252.128] port 22.
  debug1: Connection established.
  debug1: identity file /home/masterkraft0r/.ssh/id_rsa type 1
  debug1: key_load_public: No such file or directory
  debug1: identity file /home/masterkraft0r/.ssh/id_rsa-cert type -1
  debug1: key_load_public: No such file or directory
  debug1: identity file /home/masterkraft0r/.ssh/id_dsa type -1
  debug1: key_load_public: No such file or directory
  debug1: identity file /home/masterkraft0r/.ssh/id_dsa-cert type -1
  debug1: key_load_public: No such file or directory
  debug1: identity file /home/masterkraft0r/.ssh/id_ecdsa type -1
  debug1: key_load_public: No such file or directory
  debug1: identity file /home/masterkraft0r/.ssh/id_ecdsa-cert type -1
  debug1: key_load_public: No such file or directory
  debug1: identity file /home/masterkraft0r/.ssh/id_ed25519 type -1
  debug1: key_load_public: No such file or directory
  debug1: identity file /home/masterkraft0r/.ssh/id_ed25519-cert type -1
  debug1: Enabling compatibility mode for protocol 2.0
  debug1: Local version string SSH-2.0-OpenSSH_7.1
  debug1: Remote protocol version 2.0, remote software version libssh-0.7.0
  debug1: no match: libssh-0.7.0
  debug1: Authenticating to github.com:22 as 'git'
  debug1: SSH2_MSG_KEXINIT sent
  debug1: SSH2_MSG_KEXINIT received
  debug1: kex: server-&gt;client chacha20-poly1305@openssh.com &lt;implicit&gt; none
  debug1: kex: client-&gt;server chacha20-poly1305@openssh.com &lt;implicit&gt; none
  debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
  debug1: Server host key: ssh-rsa SHA256:nThbg6kXUpJWGl7E1IGOCspRomTxdCARLviKw6E5SY8
  The authenticity of host 'github.com (192.30.252.128)' can't be established.
  RSA key fingerprint is SHA256:nThbg6kXUpJWGl7E1IGOCspRomTxdCARLviKw6E5SY8.
  Are you sure you want to continue connecting (yes/no)? 
  Host key verification failed.
  </code></pre>
  
  <p>which is way over my head. can somebody tell me what went wrong and maybe how to fix this mess?</p>