title: Syntax error, unexpected tLABEL, expecting ')' (SyntaxError)
body: <h2>Environment</h2>
  
  <ul>
  <li>Ruby <strong>[1.9.3p547]</strong></li>
  <li>Rails <strong>[3.2.22.5]</strong></li>
  <li>sendgrid-ruby <strong>[4.0.8]</strong></li>
  </ul>
  
  <p>I used sendgrid-ruby gem in my application whenever I run rails server it's giving me below error which comes from gems/sendgrid-ruby-4.0.8/lib/sendgrid/client.rb:17</p>
  
  <blockquote>
    <p>/.rvm/gems/ruby-1.9.3-p547@demo/gems/sendgrid-ruby-4.0.8/lib/sendgrid-ruby.rb:1:in
    `require_relative':
    /.rvm/gems/ruby-1.9.3-p547@demo/gems/sendgrid-ruby-4.0.8/lib/sendgrid/client.rb:17:
    syntax error, unexpected tLABEL, expecting ')' (SyntaxError)
        def initialize(api_key: nil, host: nil, request_head...
                               ^ /.rvm/gems/ruby-1.9.3-p547@demo/gems/sendgrid-ruby-4.0.8/lib/sendgrid/client.rb:17:
    Can't assign to nil ...   def initialize(api_key: nil, host: nil,
    request_headers: ... ...                               ^
    /.rvm/gems/ruby-1.9.3-p547@demo/gems/sendgrid-ruby-4.0.8/lib/sendgrid/client.rb:17:
    Can't assign to nil ...ialize(api_key: nil, host: nil,
    request_headers: nil, versio... ...                               ^
    /.rvm/gems/ruby-1.9.3-p547@demo/gems/sendgrid-ruby-4.0.8/lib/sendgrid/client.rb:17:
    Can't assign to nil ...ost: nil, request_headers: nil, version: nil)</p>
  </blockquote>
  
  <p>I checked the same file and same line of gem sengrid-ruby.
  it has below the line</p>
  
  <pre><code>def initialize(api_key: nil, host: nil, request_headers: nil, version: nil)
  </code></pre>
  
  <p>if I replace this to below it isn't giving me.</p>
  
  <pre><code>def initialize(api_key, host, request_headers, version)
  </code></pre>
  
  <p>is this syntax error of rails or ruby related version? 
  There are other lots of error which contain the same syntax in other gems. 
  What should I do with this type of syntax errors?</p>