Safari

Lately while using Safari, I get the "not-secure" notice on the address bar on certain websites. One in particular is the Wyoming Travel Information Service website. In the past I've used the website extensively and until late I have never noticed the "not-secure" warning before.

I've also gotten the same warning on one other site that I commonly use so I was wondering is there is a new security feature in Safari that I am not aware of.

Thanks,