typo in proto Int32HashRange - fields not inclusive exclusive

[frankhsueh]

at time of writing:

/**
 * Represents a range of hash values [min, max)
 */
message Int32HashRange {
  // The minimum inclusive hash that the shard can contain
  fixed32 min_hash_inclusive = 1;

  // The maximum inclusive hash that the shard can contain
  fixed32 max_hash_inclusive = 2;  //////// ******** should be exclusive, same w comments
}