Update README.md

Author: cheton

README.md

@@ -79,12 +79,17 @@ github-release \
   "releases/file.tar.gz"
 ```
 
-If you're using Travis CI, you may want to encrypt environment variables.
+If you're using Travis CI, you may want to encrypt environment variables:
+
+```
+travis encrypt GITHUB_TOKEN=your_token
+```
 
 Learn how to define encrypted variables in .travis.yml:<br>
 https://docs.travis-ci.com/user/environment-variables/#Defining-encrypted-variables-in-.travis.yml
 
 ## Examples
+
 https://github.com/cncjs/cncjs/blob/master/.travis.yml
 
 ## License