Commits on May 5, 2021

1. Add a lifetime to Replacer …

   The current implementation requires any implementations of `Replacer` be
   valid for all possible lifetimes. However, this is neither required nor
   is it always desirable. For example, a user who wishes to use the
   lifetime of the input text as some part of the return type when
   interacting with these APIs would end up with a closure that is valid
   for one specific lifetime.
   
   A concrete example of where this was problematic was described in
   rust-lang#775
   
   Any future code that does require a `Replacer` which is valid for all
   lifetimes can do so with HRTB:
   
   ```
   where
       for<'a> R: Replacer<'a>
   ```
   
   or `R: Replacer<'_>` in some contexts

   

   sgrif committed May 5, 2021
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