Use URI::RFC2396_PARSER.escape explicitly.

warning: URI::RFC3986_PARSER.escape is obsolete. Use URI::RFC2396_PARSER.escape explicitly.

The code I was using was along those lines:

begin
    this_webpage = URI.parse(this_webpage)
  rescue URI::InvalidURIError
    this_webpage = URI.parse(URI::Parser.new.escape(this_webpage))
  end

Could you guys clean this up internally? In my own downstream code I never
use either of those two constants, but I do have warnings on, so I notice
this warning. I reckon this may simply be to change towards the other RFC,
but I don't know the URI internals well enough to suggest anything really.

Search the URI library for uses of URI::RFC3986_PARSER.escape and URI::Parser.new.escape, then start at the URI.parse fallback that rescues URI::InvalidURIError. The change is done when the obsolete warning no longer appears while escaping invalid input continues to work; verify with the URI parsing and escaping tests.