Add homebrew download for macos

Closes: #10

Author: Zuruuh

docs/downloads.html

@@ -206,6 +206,14 @@ <h3>Binaries</h3>
 <br>
 Thanks to Christian Hesse.
 </li>
+<li><b>MacOS</b>: htop is included in the default Homebrew formulae, you can install it with:
+<tt>
+brew install htop
+</tt>
+<br>
+Thanks to the
+<a href='https://github.com/Homebrew/homebrew-core/blame/master/Formula/h/htop.rb'>homebrew contributors.</a>
+</li>
 </ul>
 <p></p>
 </div>

downloads.haml

@@ -129,6 +129,14 @@
               pacman -S htop
             %br/
             Thanks to Christian Hesse.
+          %li
+            %b> MacOS
+            \: htop is included in the default Homebrew formulaes, you can install it with:
+            %tt
+              brew install htop
+            %br/
+            Thanks to
+            %a{:href => "https://github.com/Homebrew/homebrew-core/blame/master/Formula/h/htop.rb"} contributors
         %p
     %br/
     %br/