Simplify eslint matchers in package.json

[josecelano]

The yarn lint command uses ESLint to check linting:

You can use glob syntax and I suppose we can define what we want only with one glob pattern:

"lint": "eslint --fix **src/*.ts; eslint --fix **src/**/*.ts; eslint --fix __tests__/**/*.ts",
"lint-check": "eslint **src/*.ts; eslint **src/**/*.ts; eslint __tests__/**/*.ts",

instead of calling ESLint three issues.