MINOR. A small REST API typo in the README

[ajbozarth]

README incorrectly said logs instead of log for the sessions REST API call, it is correct for the batches call below.

[codecov-io]

Codecov Report

Merging #289 into master will decrease coverage by -0.03%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #289      +/-   ##
============================================
- Coverage     70.51%   70.49%   -0.03%     
+ Complexity      674      671       -3     
============================================
  Files            92       92              
  Lines          4812     4812              
  Branches        720      720              
============================================
- Hits           3393     3392       -1     
  Misses          927      927              
- Partials        492      493       +1

Impacted Files	Coverage Δ	Complexity Δ
...la/com/cloudera/livy/scalaapi/ScalaJobHandle.scala	52.94% <ø> (-2.95%)	0% <ø> (ø)
...ain/scala/com/cloudera/livy/sessions/Session.scala	73.58% <ø> (-0.95%)	18% <ø> (-1%)
...n/java/com/cloudera/livy/rsc/driver/RSCDriver.java	77.15% <ø> (-0.44%)	39% <ø> (-1%)
.../java/com/cloudera/livy/rsc/driver/JobWrapper.java	80.64% <ø> (ø)	7% <ø> (-1%)	❌
...c/src/main/java/com/cloudera/livy/rsc/rpc/Rpc.java	78.61% <ø> (+0.62%)	12% <ø> (ø)	❌
rsc/src/main/java/com/cloudera/livy/rsc/Utils.java	85.71% <ø> (+2.38%)	15% <ø> (ø)	❌

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[zjffdu]

Thanks for contribution. @ajbozarth