Remove UnsupportedOperationException thrown in notifyListeners

[ScienJus]

Result:

Fixes #194

[codecov-io]

Codecov Report

Merging #206 into master will decrease coverage by 0.31%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             master    #206      +/-   ##
===========================================
- Coverage     71.62%   71.3%   -0.32%     
+ Complexity      968     957      -11     
===========================================
  Files           341     341              
  Lines         14213   14213              
  Branches       2286    2286              
===========================================
- Hits          10180   10135      -45     
- Misses         2839    2882      +43     
- Partials       1194    1196       +2

Impacted Files	Coverage Δ	Complexity Δ
...ipay/sofa/rpc/message/bolt/BoltResponseFuture.java	70% <ø> (ø)	4 <0> (ø)	⬇️
...y/sofa/rpc/registry/local/LocalRegistryHelper.java	42.98% <0%> (-18.43%)	10% <0%> (-6%)
.../alipay/sofa/rpc/registry/local/LocalRegistry.java	57.22% <0%> (-12.05%)	25% <0%> (-3%)
...m/alipay/sofa/rpc/common/struct/MapDifference.java	75.67% <0%> (-10.82%)	0% <0%> (ø)
...pay/sofa/rpc/transport/ClientTransportFactory.java	73.84% <0%> (-4.62%)	0% <0%> (ø)
.../alipay/sofa/rpc/metrics/lookout/RpcLookoutId.java	70.73% <0%> (-2.44%)	10% <0%> (-1%)
...ent/aft/impl/ServiceHorizontalMeasureStrategy.java	84.44% <0%> (-2.23%)	26% <0%> (-1%)
...n/java/com/alipay/sofa/rpc/common/SofaConfigs.java	83.92% <0%> (-1.79%)	0% <0%> (ø)
.../sofa/rpc/registry/zk/ZookeeperRegistryHelper.java	75% <0%> (-1.43%)	0% <0%> (ø)
...ava/com/alipay/sofa/rpc/config/RegistryConfig.java	89.21% <0%> (-0.99%)	0% <0%> (ø)
... and 2 more

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