release v0.1.8

• fix BERT Embedding model's to_json function, issue #19

release v0.1.7

• remove class candidates filter to fix #16
• overwrite init function in CustomEmbedding
• add parameter check to custom_embedding layer
• add keras-bert version to setup.py file

release v0.1.6

• add output_dict, debug_info params to text_classification model
• add output_dict, debug_info and chunk_joiner params to text_classification model
• fix possible crash at data_generator

release v0.1.5

• fix sequence labeling evaluate result output
• refactor model save and load function