PARQUET-2299: Use `true` instead of `1` as default value for boolean (#210)

diff --git a/src/main/thrift/parquet.thrift b/src/main/thrift/parquet.thrift
index aa4375b..5f50f00 100644
--- a/src/main/thrift/parquet.thrift
+++ b/src/main/thrift/parquet.thrift
@@ -581,7 +581,7 @@
   definition_levels_byte_length + repetition_levels_byte_length + 1 and compressed_page_size (included)
   is compressed with the compression_codec.
   If missing it is considered compressed */
-  7: optional bool is_compressed = 1;
+  7: optional bool is_compressed = true;
 
   /** optional statistics for the data in this page **/
   8: optional Statistics statistics;