Change Authorization header type for API requests from "token" to "…

…Bearer" (decaporg#7242)

The authorization type "Bearer" is more widely recognized than "token". E.g. Gitlab requires that you use "Bearer".
This should fix decaporg#7172 where apparently login with Github was broken by this line: decaporg#7172 (comment)
See also: decaporg#5844 (comment)

packages/decap-cms-lib-util/src/API.ts

@@ -182,7 +182,7 @@ async function constructRequestHeaders(headerConfig: HeaderConfig) {
   const { token, headers } = headerConfig;
   const baseHeaders: HeaderObj = { 'Content-Type': 'application/json; charset=utf-8', ...headers };
   if (token) {
-    baseHeaders['Authorization'] = `token ${token}`;
+    baseHeaders['Authorization'] = `Bearer ${token}`;
   }
   return Promise.resolve(baseHeaders);
 }