Updated Semantic Versioning links to be HTTPS.

It's best to be secure by default.

[ci skip]

README.md

@@ -159,7 +159,7 @@ project is built upon the functions found in the `lib` folder. See the
 
 ## Versioning
 
-Read [Semantic Versioning](http://semver.org) for details. Briefly, it means:
+Read [Semantic Versioning](https://semver.org) for details. Briefly, it means:
 
 - Major (X.y.z) - Incremented for any backwards incompatible public API changes.
 - Minor (x.Y.z) - Incremented for new, backwards compatible, public API enhancements/fixes.