Fix scalastyle warnings

[fe2s]

There are quite a lot of scalastyle warnings:

[INFO] --- scalastyle-maven-plugin:0.7.0:check (default) @ spark-redis ---
warning file=/Users/oleksiidiagiliev/Projects/spark-redis/src/main/scala/org/apache/spark/sql/redis/stream/RedisStreamReader.scala message=File line length exceeds 120 characters line=25
warning file=/Users/oleksiidiagiliev/Projects/spark-redis/src/main/scala/org/apache/spark/sql/redis/stream/RedisStreamReader.scala message=File line length exceeds 120 characters line=42
warning file=/Users/oleksiidiagiliev/Projects/spark-redis/src/main/scala/org/apache/spark/sql/redis/RedisSourceRelation.scala message=File line length exceeds 120 characters line=9

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