doc: fix typo in README.md

Author: bfabio

README.md

@@ -55,7 +55,7 @@ their repositories.
 
 ### `publiccode-crawler crawl-software <software> <publisher>`
 
-Crawl just the software specified as paramenter.
+Crawl just the software specified as parameter.
 It takes the software URL and its publisher id as parameters.
 
 Ex. `publiccode-crawler crawl-software https://api.developers.italia.it/v1/software/a2ea59b0-87cd-4419-b93f-00bed8a7b859 edb66b3d-3e36-4b69-aba9-b7c4661b3fdd`