title: Ruby 2.4 on Mac OS Mojave : image not found ... related to openssl.bundle
body: <p>So i upgraded my Ruby to 2.4.9 on Mac OS Mojave. </p>
  
  <p>I'm having trouble gem-installing...</p>
  
  <pre><code>    proj$ gem install google-cloud-vision
  ERROR:  Loading command: install (LoadError)
      dlopen(/Users/mc/.rbenv/versions/2.4.2/lib/ruby/2.4.0/x86_64-darwin16/openssl.bundle, 9): Library not loaded: /usr/local/opt/openssl/lib/libssl.1.0.0.dylib
    Referenced from: /Users/mc/.rbenv/versions/2.4.2/lib/ruby/2.4.0/x86_64-darwin16/openssl.bundle
    Reason: image not found - /Users/mc/.rbenv/versions/2.4.2/lib/ruby/2.4.0/x86_64-darwin16/openssl.bundle
  ERROR:  While executing gem ... (NoMethodError)
      undefined method `invoke_with_build_args' for nil:NilClass
  
  proj$ ruby -v
  ruby 2.4.2p198 (2017-09-14 revision 59899) [x86_64-darwin16]
  </code></pre>
  
  <p>I already did a bunch of brew update &amp;&amp; brew upgrade, but i'm stuck... any pointers?</p>