Merge pull request #1105 from SISheogorath/fix/gistCSP

Fix broken Gist embedding

Author: SISheogorath

lib/csp.js

@@ -8,7 +8,7 @@ var defaultDirectives = {
   scriptSrc: ['\'self\'', 'vimeo.com', 'https://gist.github.com', 'www.slideshare.net', 'https://query.yahooapis.com', '\'unsafe-eval\''],
   // ^ TODO: Remove unsafe-eval - webpack script-loader issues https://github.com/hackmdio/codimd/issues/594
   imgSrc: ['*'],
-  styleSrc: ['\'self\'', '\'unsafe-inline\'', 'https://assets-cdn.github.com'], // unsafe-inline is required for some libs, plus used in views
+  styleSrc: ['\'self\'', '\'unsafe-inline\'', 'https://github.githubassets.com'], // unsafe-inline is required for some libs, plus used in views
   fontSrc: ['\'self\'', 'data:', 'https://public.slidesharecdn.com'],
   objectSrc: ['*'], // Chrome PDF viewer treats PDFs as objects :/
   mediaSrc: ['*'],