Add Let's encrypt to the "Domain and IP Research"

Wanted to add Let's Encrypt to the  "Domain and IP Research" section.
It's an awesome addition to this great list.

* [Let’s Encrypt] (https://letsencrypt.org/) - Free, automated, and open Certificate Authority
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himaliwade 2020-01-31 13:44:07 +05:30 committed by GitHub
commit 99510b7762
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GPG key ID: 4AEE18F83AFDEB23

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@ -677,6 +677,7 @@ Thanks to our main contributors
* [IPFingerprints](http://www.ipfingerprints.com) * [IPFingerprints](http://www.ipfingerprints.com)
* [IPVoid](http://www.ipvoid.com) - IP address toolset. * [IPVoid](http://www.ipvoid.com) - IP address toolset.
* [IntelliTamper](http://www.softpedia.com/get/Internet/Other-Internet-Related/IntelliTamper.shtml) * [IntelliTamper](http://www.softpedia.com/get/Internet/Other-Internet-Related/IntelliTamper.shtml)
* [Lets Encrypt](https://letsencrypt.org/) - Free, automated, and open Certificate Authority
* [Kloth](http://www.kloth.net/services) * [Kloth](http://www.kloth.net/services)
* [NetworkTools](http://network-tools.com) * [NetworkTools](http://network-tools.com)
* [Majestic](https://majestic.com) * [Majestic](https://majestic.com)