fix: replace leetcode-cn graphql request query argument which cause 400#42

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TangliziGit wants to merge 3 commits intoskygragon:masterfrom TangliziGit:master

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Commits on Aug 10, 2020

fix: replace leetcode-cn graphql request query argument
TangliziGit
committed
fix: change language name from big camel case into lower case
TangliziGit
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Commits on Sep 7, 2020

fix: remove external file 'leetcode.js'
TangliziGit
committed