Define okhttp version in top level build.gradle, along with other dep…

[objectiser]

…endencies

Follow on from #397 - to include missed okhttp dependency.

Signed-off-by: Gary Brown gary@brownuk.com

[codecov]

Codecov Report

Merging #402 into master will decrease coverage by 0.19%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             master     #402     +/-   ##
===========================================
- Coverage     84.45%   84.25%   -0.2%     
  Complexity      500      500             
===========================================
  Files            66       66             
  Lines          2033     2033             
  Branches        247      247             
===========================================
- Hits           1717     1713      -4     
- Misses          235      239      +4     
  Partials         81       81

Impacted Files	Coverage Δ	Complexity Δ
...in/java/io/jaegertracing/senders/ThriftSender.java	75% <0%> (-4.55%)	10% <0%> (ø)
...ava/io/jaegertracing/reporters/RemoteReporter.java	84.7% <0%> (-2.36%)	8% <0%> (ø)

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