Fix typos in Readme
Fix typos in Readme

`foucus` → `focus`
`flexibillity` → `flexibility`
`chekout` → `checkout`
`Peformance` → `Performance`
`opperations` → `operations`
`Fetures` → `Features`
`standarts` → `standarts`
`convinient` → `convenient`
`specifik` → `specific`
`unif` → `unit`
`concurent` → `concurrent`
`streamming` → `streaming`
`progresss` → `progress`
kanghj/alasql,agershun/alasql,agershun/alasql,kanghj/alasql,agershun/alasql,agershun/alasql,kanghj/alasql