HTTP Basic Auth fixed

[slowbrain]

Base64 encode changed

[malmaud]

Thanks! Do we have a test for basic auth?

[codecov-io]

Current coverage is 68.62% (diff: 0.00%)

Merging #134 into master will decrease coverage by 0.12%

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[slowbrain]

I wish I know how to write a test...
tested it on following:

julia> get("https://user:passwd@httpbin.org/hidden-basic-auth/user/passwd")
Response(200 OK, 11 headers, 47 bytes in body)

[malmaud]

NP, I'll write the test.