fix: misskey detection could fail due to an early axios throw

[mogita]

Hi h3poteto,

Thank you for maintaining such a wonderful library. I'm building a tool based on megalodon.

Meanwhile I found that detection on misskey.io failed with the 5.4.0 version. Without the try catch block, Axios would throw on attempting to visit https://misskey.io/api/v1/instance in the first place. So I added the try catch back with a little more explicitness.

Changes (all tests passed):

• detector handles sns name detection more thoroughly
• detector explicitly returns null if no known platform can be detected

Please let me know how you think and if there's anything that I missed or have done incorrectly. Thanks!

[h3poteto]

I'm wondering why the master test passed.

megalodon/megalodon/test/integration/megalodon.spec.ts

Lines 20 to 26 in bf9c887

	describe('misskey', () => {
	const url = 'https://misskey.io'
	it('should be misskey', async () => {
	const misskey = await detector(url)
	expect(misskey).toEqual('misskey')
	})
	})

[h3poteto]

👍