Add follow-redirects options support

[pachirel]

I saw issue #1412 and PR #1441.
I'd like to support all follow-redirects options, I created another PR to support it.

I respect the attribute format of #1441.

Notes:

• I found it's required to update DefinitelyTyped. Because followRedirects option is declared as boolean.
• I haven't checked which follow-redirects versions support these options. I tested 1.9.0 (defined in package-lock.json) and 1.14.1. Please check your follow-redirects version.

[codecov-commenter]

Codecov Report

Merging #1533 (f7f3c6a) into master (9b96cd7) will increase coverage by 0.14%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1533      +/-   ##
==========================================
+ Coverage   92.38%   92.52%   +0.14%     
==========================================
  Files           6        6              
  Lines         315      321       +6     
==========================================
+ Hits          291      297       +6     
  Misses         24       24              

Impacted Files	Coverage Δ
lib/http-proxy/common.js	97.29% <100.00%> (+0.23%)	⬆️

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