Update spark-avro dependency

[marmbrus]

No description provided.

[JoshRosen]

java.lang.ClassCastException: org.apache.hadoop.mapreduce.Job cannot be cast to org.apache.hadoop.mapred.JobContext
    at org.apache.hadoop.mapred.OutputCommitter.setupJob(OutputCommitter.java:213)
    at org.apache.spark.sql.sources.BaseWriterContainer.driverSideSetup(commands.scala:351)
    at org.apache.spark.sql.sources.InsertIntoHadoopFsRelation.insert(commands.scala:157)
    at org.apache.spark.sql.sources.InsertIntoHadoopFsRelation.run(commands.scala:139)
    at org.apache.spark.sql.execution.ExecutedCommand.sideEffectResult$lzycompute(commands.scala:57)
    at org.apache.spark.sql.execution.ExecutedCommand.sideEffectResult(commands.scala:57)
    at org.apache.spark.sql.execution.ExecutedCommand.doExecute(commands.scala:68)
    at org.apache.spark.sql.execution.SparkPlan$$anonfun$execute$1.apply(SparkPlan.scala:88)
    at org.apache.spark.sql.execution.SparkPlan$$anonfun$execute$1.apply(SparkPlan.scala:88)
    at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:147)
    at org.apache.spark.sql.execution.SparkPlan.execute(SparkPlan.scala:87)
    at org.apache.spark.sql.SQLContext$QueryExecution.toRdd$lzycompute(SQLContext.scala:950)
    at org.apache.spark.sql.SQLContext$QueryExecution.toRdd(SQLContext.scala:950)

Looks like a symptom of a possible Hadoop version mismatch?

[JoshRosen]

I'm thinking that this could actually be a classloading issue because otherwise the error message doesn't make a lot of sense to me. The error is org.apache.hadoop.mapreduce.Job cannot be cast to org.apache.hadoop.mapred.JobContext, but Job implements mapreduce.JobContext, which in turn extends mapred.JobContext.

[codecov-io]

Current coverage is 94.90%

Merging #75 into master will decrease coverage by -0.05% as of 85e5560

@@            master    #75   diff @@
=====================================
  Files           11     11       
  Stmts          436    432     -4
  Branches       100    100       
  Methods          0      0       
=====================================
- Hit            414    410     -4
  Partial          0      0       
  Missed          22     22       

Review entire Coverage Diff as of 85e5560

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[JoshRosen]

Spotted the problem and fixed things, so I'm going to merge this fix now. We can bump to 2.0.1 in a separate commit.