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II deactivated the "Require TLS 1.1 or higher for HTTPS connections" Salesforce Critical Update, tried the URL again, and I was able to log in and deploy the Github Repo to my Sandbox.
First, thanks for the awesome tool.
Today, Monday 2016-06-13, I tried deploying a GitHub project to a Sandbox via https://githubsfdeploy-sandbox.herokuapp.com/app/githubdeploy/flexchecks/flexchecks. (Note: It's a private repo) It asked me to log in to my Sandbox User, but the authentication failed:
II deactivated the "Require TLS 1.1 or higher for HTTPS connections" Salesforce Critical Update, tried the URL again, and I was able to log in and deploy the Github Repo to my Sandbox.