Travis test

.travis.yml

diff --git a/.travis.yml b/.travis.yml
index 5d3303a..c97077a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -24,9 +24,6 @@
     - sudo apt-get install tclsh
     - sudo apt install default-jre
     - sudo apt-get install swig
-    - sudo add-apt-repository ppa:deadsnakes/ppa
-    - sudo apt-get update
-    - sudo apt-get install python3.6
     - sudo apt-get install google-perftools
     - sudo apt-get install libgoogle-perftools-dev
     - eval "${MATRIX_EVAL}"