doc : minor edit in README

sepandhaghighi · sepandhaghighi · commit 9baf7750057d · 2020-07-20T16:35:55.000+04:30
diff --git a/README.md b/README.md
@@ -245,7 +245,7 @@ orangetool.version() # return orangetool version for test
 
 #9- check_update
 
-orangetool.check_update # Return True if new version is available
+orangetool.check_update() # Return True if new version is available
 
 ```
 
