Update README.md

README.md

@@ -31,7 +31,7 @@ Paperbot stores keywords that are used to identify interesting preprints. The ke
 
 Paperbot also includes an authors list which can be built manually. This is done by executing the command `@paperbot add_author some_author` on Slack. Executing `@paperbot authors` on Slack prints the authors list. 
 
-Paperbot provides a method to generate the author list automatically. This is an important feature that helps to easily build a powerful preprint filter. It requires the definition of a few root keywords, such as 'superconducting qubit', 'quantum optics', and 'quantum information'. Executing the command `@paperbot build 2018 ['superconducting qubit', 'quantum optics', 'quantum information'] threshold` on Slack, paperbot searchs day-by-day over all arXiv papers submitted in '2018', and saves the name of the authors that have at least a 'threshold' number of papers including any of the root keywords in its title or abstract. The result of further executions of the `build` command is always appended to the author list. In particular, running `build` every new year keeps the author list up-to-date.
+Paperbot provides a method to generate the author list automatically. This is an important feature that helps to easily build a powerful preprint filter. It requires the definition of a few root keywords, such as 'superconducting qubit', 'quantum optics', and 'quantum information'. Executing the command `@paperbot build 2018 ['superconducting qubit', 'quantum optics', 'quantum information'] threshold` on Slack, paperbot searchs day-by-day over all arXiv papers submitted in '2018', and saves the name of the authors that have at least a 'threshold' number of papers including any of the root keywords in its title or abstract. The result of further executions of the `build` command is always appended to the author list. In particular, running `build` every new year keeps the author list up-to-date. Note that for unknown reasons, paperbot Salck App status might _only_ appear as 'offline' while being online and executing the `build` command correctly. 
 
 **Define your favourite authors to be hightlighted**