Fix travis CI deploy step

Author: anubhavp28

.travis.yml

@@ -64,4 +64,4 @@ deploy:
   on:
     tags: true
     repo: scrapy/protego
-    condition: "$TOXENV == py27 && $TRAVIS_TAG =~ ^[0-9]+[.][0-9]+[.][0-9]+(rc[0-9]+|[.]dev[0-9]+)?$"
+    condition: "$TOXENV == py39 && $TRAVIS_TAG =~ ^[0-9]+[.][0-9]+[.][0-9]+(rc[0-9]+|[.]dev[0-9]+)?$"