message: Fix GraphQL calls on GH Enterprise
  Fixes
diff: @@ -43,8 +43,13 @@ export class RefinedGitHubAPIError extends Error {
  }
  }
  -const api = location.hostname === 'github.com' ? 'https://api.github.com/' : `${location.origin}/api/v3/`;
  const cache = new Map<string, AnyObject>();
  +const api3 = location.hostname === 'github.com' ?
  + 'https://api.github.com/' :
  + `${location.origin}/api/v3/`;
  +const api4 = location.hostname === 'github.com' ?
  + 'https://api.github.com/graphql' :
  + `${location.origin}/api/graphql/`;
  function fetch3(query: string, personalToken: string) {
  const headers: HeadersInit = {
  @@ -55,7 +60,7 @@ function fetch3(query: string, personalToken: string) {
  headers.Authorization = `token ${personalToken}`;
  }
  - return fetch(api + query, {headers});
  + return fetch(api3 + query, {headers});
  }
  function fetch4(query: string, personalToken: string) {
  @@ -63,7 +68,7 @@ function fetch4(query: string, personalToken: string) {
  throw new Error('Personal token required for this feature');
  }
  - return fetch(api + 'graphql', {
  + return fetch(api4, {
  headers: {
  'User-Agent': 'Refined GitHub',
  Authorization: `bearer ${personalToken}`
  