[Feature Request] support rust lang

[perkfly]

Problem Summary

Invalid values:
Argument: l, Given: "rust", Choices: "bash", "c", "cpp", "csharp", "golang", "java", "javascript", "kotlin", "mysql", "python", "python3", "ruby", "scala", "swift"

[skygragon]

rust support has been merged while not released yet. You could try latest dev version via npm install -g skygragon/leetcode-cli

[skygragon]

see #142