title: Hypen is not supporting GraphQL
body: <p>I am new to graphQL, When I am trying to define a schema with hyphen/dash it shows error. But underscore is not making any issues.</p>
  
  <pre><code># Type of Hello
  enum HowAreYou{
    Hello-Hello
    Hai-Hai
  }
  
  
  
  throw (0, _error.syntaxError)(source, position, 'Invalid number,         expected digit but got: ' + printCharCode(code) + '.');
   ^
  GraphQLError: Syntax Error GraphQL request (176:9) Invalid number,     expected digit but got: "H".
  
  175: enum HowAreYou{
  176:   Hello-Hello
           ^
  177:   Hai-Hai
  </code></pre>