Update Python dependencies

Author: mdmintz

requirements.txt

@@ -34,7 +34,7 @@ cryptography==2.9.2
 pyopenssl==19.1.0
 pygments==2.5.2;python_version<"3.5"
 pygments==2.6.1;python_version>="3.5"
-livereload==2.6.2
+livereload==2.6.2;python_version>="3.6"
 colorama==0.4.3
 brython>=3.8.9
 pymysql==0.9.3