Update README.md

Removed OS dependent commands

README.md

@@ -55,18 +55,7 @@ You can use the list format of `ROBOT_RUN_TESTS` as a way to specify the order i
 
 Robot creates an HTML test report describing test successes/failures.
 
-To view the report, run the following:
-#### For Mac+Linux:
-
-```
-open .acceptance/report.html
-```
-
-#### For Windows:
-
-```
-start chrome .acceptance/report.html
-```
+To view the report, open `.acceptance/report.html` in your browser.
 
 Note: by default, the tests will output to the `.acceptance/` directory.
 To modify this location, set the `ROBOT_OUTPUT_DIR` environment variable.