Add codecov ignores

[vprithvi]

Also set precision to 2.

[codecov-io]

Codecov Report

Merging #153 into master will increase coverage by 43.87%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             master     #153       +/-   ##
=============================================
+ Coverage     36.24%   80.11%   +43.87%     
+ Complexity      598      457      -141     
=============================================
  Files            94       76       -18     
  Lines          6349     1715     -4634     
  Branches       1052      188      -864     
=============================================
- Hits           2301     1374      -927     
+ Misses         3866      255     -3611     
+ Partials        182       86       -96

Impacted Files	Coverage Δ	Complexity Δ
...java/com/uber/jaeger/samplers/SamplingManager.java
...main/java/com/uber/jaeger/crossdock/Constants.java
...a/com/uber/jaeger/crossdock/api/TraceResponse.java
...crossdock/resources/behavior/EndToEndBehavior.java
...ources/behavior/http/EndToEndBehaviorResource.java
...om/uber/jaeger/crossdock/api/JoinTraceRequest.java
...resources/behavior/http/TraceBehaviorResource.java
...ck/resources/behavior/tchannel/TChannelServer.java
...ore/src/main/java/com/uber/jaeger/metrics/Tag.java
...java/com/uber/jaeger/crossdock/api/Downstream.java
... and 12 more

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[pavolloffay]

IIRC this is only in jaeger-thrift which you are ignoring just above