Add favicon to meta data

[LarchLiu]

In some cases, I might want to retrieve the favicon of a website, so I add it.

[LarchLiu]

I checked this issue #120. As you may know, in China, we do not have access to Google. Therefore, I would like to add this feature if it is possible.

[ndaidong]

@LarchLiu thank you, let me see the pr.

[ndaidong]

@LarchLiu I've released v7.2.17 with your pr. Thank you for your contributions.

[LarchLiu]

@ndaidong Thanks a lot. It is very helpful to me.

[coveralls]

Pull Request Test Coverage Report for Build 5418934645

Warning: This coverage report may be inaccurate.

We've detected an issue with your CI configuration that might affect the accuracy of this pull request's coverage report. To ensure accuracy in future PRs, please see these guidelines. A quick fix for this PR: rebase it; your next report should be accurate.

• 4 of 4 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.08%) to 95.908%

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Totals
Change from base Build 5428376447:	0.08%
Covered Lines:	242
Relevant Lines:	243

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💛 - Coveralls