Limu, the fastest immutable data JavaScript lib was borned

Strongly recommend trying [limu](https://github.com/tnfe/limu)，it is now the fastest immutable data js lib，and it is also production environment available.

//You can verify through the following tests, and you are also welcome to add more performance test cases ```bash git checkout https://github.com/tnfe/limu.git cd benchmark npm i ## Then execute the following commands separately npm run s1 npm run s2 npm run s3 npm run s4 ``` The results of one set of performance tests 

At the same time, the number of single test cases has increased to 500+, with a coverage rate of '95+' (the results can be viewed by executing NPM run tests in the root directory)