Fix version check in train_gnmt.py and train_transformer.py (#1003)

Author: leezu

scripts/machine_translation/train_gnmt.py

@@ -55,7 +55,7 @@
 random.seed(100)
 mx.random.seed(10000)
 
-nlp.utils.check_version('0.7.0')
+nlp.utils.check_version('0.9.0')
 
 parser = argparse.ArgumentParser(description='Neural Machine Translation Example.'
                                              'We train the Google NMT model')

scripts/machine_translation/train_transformer.py

@@ -57,7 +57,7 @@
 random.seed(100)
 mx.random.seed(10000)
 
-nlp.utils.check_version('0.7.0')
+nlp.utils.check_version('0.9.0')
 
 parser = argparse.ArgumentParser(
     formatter_class=argparse.ArgumentDefaultsHelpFormatter,