Update Netty version to 4.1.24.Final

[lhotari]

• see release notes http://netty.io/news/2018/04/19/4-1-24-Final.html

[codecov-io]

Codecov Report

Merging #328 into master will decrease coverage by 0.2%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #328      +/-   ##
============================================
- Coverage     68.54%   68.33%   -0.21%     
+ Complexity     1027     1023       -4     
============================================
  Files            73       73              
  Lines          4314     4314              
  Branches        614      614              
============================================
- Hits           2957     2948       -9     
- Misses          989      997       +8     
- Partials        368      369       +1

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/reactor/ipc/netty/FutureMono.java	82% <0%> (-4%)	5% <0%> (-1%)
...ctor/ipc/netty/resources/DefaultPoolResources.java	75.86% <0%> (-3.45%)	8% <0%> (-1%)
.../ipc/netty/http/client/HttpClientWSOperations.java	77.33% <0%> (-1.34%)	19% <0%> (ø)
...or/ipc/netty/http/client/HttpClientOperations.java	56.31% <0%> (-1.06%)	78% <0%> (-2%)
...or/ipc/netty/http/server/HttpServerOperations.java	70.52% <0%> (-0.53%)	55% <0%> (-1%)
...tor/ipc/netty/channel/CloseableContextHandler.java	57.89% <0%> (+5.26%)	9% <0%> (+1%)	⬆️

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[violetagg]

thanks