-Bump database version to 2.

-Added migration script for upgrading database from version 1 to 2.
-Fixed database name of stream type in stream entity.

app/src/main/java/org/schabi/newpipe/fragments/local/StreamRecordManager.java

@@ -35,7 +35,7 @@ public class StreamRecordManager {
     }
 
     public int removeHistory(final long streamId) {
-        return historyTable.deleteHistory(streamId);
+        return historyTable.deleteStreamHistory(streamId);
     }
 
     public Flowable<List<StreamStatisticsEntry>> getStatistics() {