Merge pull request #7 from explore-node-js/eugene-matvejev-patch-1

update README.md

Author: eugene-matvejev

README.md

@@ -1,3 +1,15 @@
+[circle.ci-master-badge]: https://circleci.com/gh/explore-node-js/node.js-bytes-calculator/tree/master.svg?style=svg
+[circle.ci-master-link]: https://circleci.com/gh/explore-node-js/node.js-bytes-calculator/tree/master
+[codecov.io-master-badge]: https://codecov.io/gh/explore-node-js/node.js-bytes-calculator/branch/master/graph/badge.svg
+[codecov.io-master-link]: https://codecov.io/gh/explore-node-js/node.js-bytes-calculator
+
+|                       | master
+|---                    |---
+| __tests__             |
+| _< Circle CI >_ build | [![build][circle.ci-master-badge]][circle.ci-master-link]
+| __coverage__          |
+| codecov.io            | [![coverage][codecov.io-master-badge]][codecov.io-master-link]
+
 # node.js-bytes-calculator
 abstract and easy way how to work with bytes in JS
 
@@ -9,9 +21,7 @@ abstract and easy way how to work with bytes in JS
  * jest _[for tests only]_
 
 ## how to execute tests
- `npm test`
-to execute tests with coverage
- `npm test -- --coverage`
+ `npm test` or, to execute tests with coverage `npm test -- --coverage`
 
 ## how to use
 `import calc from "node-bytes-calculator";` or `const calc = require("node-bytes-calculator");`