fix typo in tools/README.md

Author: vchrisb

tools/README.md

@@ -23,7 +23,7 @@ options:
 
 ## Run tests
 
-The script `test.py` will run all non altering methods for `pye3dc` for testing or sharing the output.
+The script `tests.py` will run all non altering methods for `pye3dc` for testing or sharing the output.
 
 ### usage
 
@@ -72,4 +72,4 @@ required named arguments:
   -p PASSWORD, --password PASSWORD
                         password of E3DC
   -k KEY, --key KEY     key of E3DC
-```
+```