Changes since langchain-perplexity==0.1.0
perplexity: release 0.1.1 (#30859)
perplexity[patch]: Fix #30767: Handle missing citations attribute in ChatPerplexity (#30805)
partners[lint]: run pyupgrade to get code in line with 3.9 standards (#30781)
docs: fix perplexity install instructions in ChatPerplexity docstring (#30676)