Haralyzer

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* Feature - Creation of HarEntry class to get all the entries from a HarPage.
Provided by Cyb3r-Jak3

* Switched from Travis-CI to GitHub Actions.
Provided by Cyb3r-Jak3

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* FEATURE - Add load_time__gt to HarPage.filter_entries.
Provided by gowthamraj198.

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* BUGFIX - Default to empty string if a page has not title.
Provided by pckizer.

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* Added `duplicate_url_requests` method provided by gowthamraj198.

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* Resolved issue with entries in HAR files which do not belong to a page. The
new behavior will create a "fake" HarPage with an ID of "unknown" if one or
more of these entries exist, and add them to it. Ths will allow the overall
HarParser to still take these entries into account for timings.

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* python 3.7 compatibility. Specifically, removing the keyword `async` which is now a reserved keyword
argument. As of right now, we are still maintaining backwards compatability, but it is deprecated and
will be removed in a future version. You should now use `asynchronous` instead. Many thanks to
NickPancakes for hooking it up.