update readme with explanation why this project was renamed

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 ![](docs/logo.jpg)
 
+*Note: This project was renamed from letsencrypt.sh because the original name was violating Let's Encrypts trademark policy. I know that this results in quite a lot of installations failing but I didn't have a choice...*
+
 This is a client for signing certificates with an ACME-server (currently only provided by letsencrypt) implemented as a relatively simple bash-script.
 
 It uses the `openssl` utility for everything related to actually handling keys and certificates, so you need to have that installed.