fix session mut borrow lifetime

[adwhit]

This fixes a lifetime issue where it is impossible to call session.set(...) more than once. e.g. calling

session.set("user_id", 1)?;
session.set("token", "1234")?;

throws an error

error[E0499]: cannot borrow `session` as mutable more than once at a time

I believe the problem is that the extra 'a in the signature ties the lifetime of the borrow to the lifetime of the Session object itself.

[fafhrd91]

oh, thanks!

[fafhrd91]

could you also add entry to CHANGES.md

[adwhit]

Done. BTW thanks for your hard work, this is a great project

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@171a235). Click here to learn what that means.
The diff coverage is 0%.

@@            Coverage Diff            @@
##             master      #87   +/-   ##
=========================================
  Coverage          ?   78.86%           
=========================================
  Files             ?       67           
  Lines             ?     8085           
  Branches          ?        0           
=========================================
  Hits              ?     6376           
  Misses            ?     1709           
  Partials          ?        0

Impacted Files	Coverage Δ
src/middleware/session.rs	0% <0%> (ø)

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[fafhrd91]

thanks for fix! the project getting bigger, I need all help I can get :)