remove faulty example of how to set per-request proxy

Closes #150

README.md

@@ -58,15 +58,8 @@ end
 
 conn.get do |req|
   req.url '/search'
-  req.options = {
+  req.options[:timeout] = 5           # open/read timeout in seconds
-    :timeout => 5,                    # open/read timeout Integer in seconds
+  req.options[:open_timeout] = 2      # connection open timeout in seconds
-    :open_timeout => 2,               # read timeout Integer in seconds
-    :proxy => {
-      :uri => "http://example.org/",  # proxy server URI
-      :user => "me",                  # proxy server username
-      :password => "test123"          # proxy server password
-    }
-  }
 end
 ```