Replace OneTimeTask references with lambdas

[nicmunroe]

For issue #51

[codecov-io]

Codecov Report

Merging #52 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##             master     #52      +/-   ##
===========================================
+ Coverage     90.18%   90.2%   +0.02%     
- Complexity     1943    1945       +2     
===========================================
  Files           141     141              
  Lines          5797    5789       -8     
  Branches        765     765              
===========================================
- Hits           5228    5222       -6     
+ Misses          388     387       -1     
+ Partials        181     180       -1

Impacted Files	Coverage Δ	Complexity Δ
...r/handler/NonblockingEndpointExecutionHandler.java	100% <100%> (ø)	29 <1> (+1)	⬆️
...r/handler/ProxyRouterEndpointExecutionHandler.java	57.56% <100%> (-0.83%)	23 <0> (ø)
.../com/nike/riposte/server/logging/AccessLogger.java	96.32% <0%> (+1.47%)	47% <0%> (+1%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 3784980...afb7d62. Read the comment docs.