v0.1.6: DPO Training and Qwen-7B

• Adapt DPO training from the TRL library
• Support fine-tuning the Qwen-7B, Qwen-7B-Chat, XVERSE-13B, and ChatGLM2-6B models
• Implement the "safe" ChatML template for Qwen-7B-Chat
• Better Web UI
• Pretty readme by @codemayq #382
• New features: #395 #451
• Fix InternLM-7B inference #312
• Fix bugs: #351 #354 #361 #376 #408 #417 #420 #423 #426