Add support for bearer auth (#1488) (#1490)

Co-authored-by: Tomas Della Vedova <delvedor@users.noreply.github.com>

lib/Connection.js

@@ -331,6 +331,8 @@ function prepareHeaders (headers = {}, auth) {
       } else {
         headers.authorization = `ApiKey ${auth.apiKey}`
       }
+    } else if (auth.bearer) {
+      headers.authorization = `Bearer ${auth.bearer}`
     } else if (auth.username && auth.password) {
       headers.authorization = 'Basic ' + Buffer.from(`${auth.username}:${auth.password}`).toString('base64')
     }