fix session end

[wpbrown]

initiating side of session end needs to enter closing state so the end response is not replied to.

[codecov[bot]]

Codecov Report

Merging #17 (6685f0f) into master (e5fcc1f) will increase coverage by 0.35%. The diff coverage is 91.30%.

@@            Coverage Diff             @@
##           master      #17      +/-   ##
==========================================
+ Coverage   53.08%   53.44%   +0.35%     
==========================================
  Files          35       35              
  Lines        3805     3815      +10     
==========================================
+ Hits         2020     2039      +19     
+ Misses       1785     1776       -9     

Impacted Files	Coverage Δ
src/session.rs	42.41% <83.33%> (+0.59%)	:arrow_up:
src/connection.rs	71.19% <100.00%> (+6.75%)	:arrow_up:
tests/test_server.rs	88.34% <100.00%> (+0.11%)	:arrow_up:
src/server/service.rs	64.75% <0.00%> (-0.82%)	:arrow_down:
src/dispatcher.rs	46.55% <0.00%> (-0.58%)	:arrow_down:

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[fafhrd91]

thanks!