Minor fix

Author: cffls

README.md

@@ -204,7 +204,8 @@ Run a specific test function in a test file:
 We use [Coverage](https://coverage.readthedocs.io/en/latest/) to calculate the test coverage.
 
 Test coverage could be generated by: `make cov`
-An html report could be generated and opened in browser by: `make cov-html`
+
+A html report could be generated and opened in browser by: `make cov-html`
 
 ### Style guidelines