LB-Yu opened a new pull request #63: Solve the ambiguous reference for scala 
2.12
URL: https://github.com/apache/hbase-connectors/pull/63
 
 
   When the `hbase-spark` module is compiled under the scala 2.12 environment, 
the following error appears in line 216 of the 
`org.apache.hadoop.hbase.spark.datasources.HBaseTableScanRDD` class:
   ```shell
   [ERROR] [Error] 
/path/hbase-connectors/spark/hbase-spark/src/main/scala/org/apache/hadoop/hbase/spark/datasources/HBaseTableScanRDD.scala:216:
 ambiguous reference to overloaded definition,
   both method addTaskCompletionListener in class TaskContext of type [U](f: 
org.apache.spark.TaskContext => U)org.apache.spark.TaskContext
   and  method addTaskCompletionListener in class TaskContext of type 
(listener: 
org.apache.spark.util.TaskCompletionListener)org.apache.spark.TaskContext
   match argument types (org.apache.spark.TaskContext => Unit)
   ```
   I solve this bug by changing the origin line:
   ```scala
   context.addTaskCompletionListener(context => close())
   ```
   To:
   ```scala
   context.addTaskCompletionListener[Unit](context => close())
   ```

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