Level color has changed in latest Github API

[97littleleaf11]

Now the color of different levels has changed to:

<li style="background-color: #ebedf0"></li>
<li style="background-color: #9be9a8"></li>
<li style="background-color: #40c463"></li>
<li style="background-color: #30a14e"></li>
<li style="background-color: #216e39"></li>

according to <div class="contrib-legend> of https://github.com/users/xxxxx/contributions

[97littleleaf11]

i am trying to fix current runtime errors, including #15