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https://github.com/NeuromatchAcademy/course-content/blob/master/tutorials/W1D3_ModelFitting/W1D3_Tutorial6.ipynb 
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CustomError: Fetch for https://api.github.com/repos/NeuromatchAcademy/course-content/contents/tutorials/W1D3_ModelFitting?per_page=100&ref=master failed: {"message":"No commit found for the ref master","documentation_url":"https://docs.github.com/v3/repos/contents/","status":"404"}
    at new pM (https://ssl.gstatic.com/colaboratory-static/common/8e5fae8429764217c8c60f7f0fea86be/external_binary.js:2441:68)
    at va.program_ (https://ssl.gstatic.com/colaboratory-static/common/8e5fae8429764217c8c60f7f0fea86be/external_binary.js:2424:436)
    at ya (https://ssl.gstatic.com/colaboratory-static/common/8e5fae8429764217c8c60f7f0fea86be/external_binary.js:16:57)
    at va.next_ (https://ssl.gstatic.com/colaboratory-static/common/8e5fae8429764217c8c60f7f0fea86be/external_binary.js:14:195)
    at kaa.next (https://ssl.gstatic.com/colaboratory-static/common/8e5fae8429764217c8c60f7f0fea86be/external_binary.js:17:48)
    at b (https://ssl.gstatic.com/colaboratory-static/common/8e5fae8429764217c8c60f7f0fea86be/external_binary.js:17:309)
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