title: rbenv install not downloading ruby version
body: <p>Installing ruby version with rbenv <code>rbenv install -l</code>returns the proper list. However </p>
  
  <pre><code>$ rbenv install 2.3.4 -v
  </code></pre>
  
  <p>fails on the download, even though it can be downloaded via a browser.  My hunch about an improper version of openssl (due to some distant memory of having such issues - tls version? - in the past) is supported in verbose mode:</p>
  
  <pre><code>ruby-build: use openssl from homebrew 
  /var/folders/kV/kVDOSPkcEuqSVnTjenAVRE+++TI/-Tmp-/ruby-build.20170601122915.1010 ~ Downloading ruby-2.3.4.tar.bz2...
  -&gt; https://cache.ruby-lang.org/pub/ruby/2.3/ruby-2.3.4.tar.bz2 
  curl: (35)    error:1407742E:SSL routines:SSL23_GET_SERVER_HELLO:tlsv1 alert protocol version 
  error: failed to download ruby-2.3.4.tar.bz2
  </code></pre>
  
  <p>how to overcome?  can I point rbenv to use the downloaded tarball?</p>