The plugin makes a vast amount of API calls to Github that results in reaching the hourly quota of the user several times a day. Here's a breakdown of the calls performed in an hour:

/repositories/:repository_id/contents/?* 2,557 54.648%
/repositories/:repository_id/collaborators 1,038 22.184%
/repositories/:repository_id/pulls/:id 177 3.783%
/repositories/:repository_id 163 3.484%
/repositories/:repository_id/git/refs/* 157 3.355%
/repositories/:repository_id/statuses/:sha 111 2.372%
/repositories/:repository_id/branches 104 2.223%