v1.0.2

• Add Kani.add_completion_to_history (useful for token counting, see #29)
• Add an example of an AIFunction definition to PromptPipeline.explain() when a function-related step is included
• Add id_translator arg to PromptPipeline.ensure_bound_function_calls()
• Ensure that OpenAIEngine and HuggingEngine streams yield a completion including prompt and completion token usage
• Various Mistral-7B Instruct v0.3 prompt fixes