update README not to encourage type-piracy

[hyrodium]

This PR just removes the paragraph that encourages type-piracy. (alternative to #56)

The removed paragraph is:

This package is intended to implement a "minimal" foundation for intervals upon which other packages might build. In particular, we encourage type-piracy for the reason that only one interval package can unambiguously define the .. and ± operators (see below).

The reasons why I would like to remove that are:

• Generally, we would like to avoid type-piracy
  • Type-piracies exist on some packages, and should be fixed. (Move methods from DomainSets.jl #127)
• If someone wants some operations to Interval, PRs are welcome.
  • If the new operation does not fit Interval, you can just add the method to your wrapper type. (e.g. struct YourInterval{L,R,T} i::Interval{L,R,T} end)

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (031a18d) 99.17% compared to head (09712d7) 99.17%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #149   +/-   ##
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  Coverage   99.17%   99.17%           
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  Files           4        4           
  Lines         242      242           
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  Hits          240      240           
  Misses          2        2           

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