Remove python 2 publish. (#48)

.travis.yml

diff --git a/.travis.yml b/.travis.yml
index 74beae5..79b2212 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -26,7 +26,7 @@
       all_branches: true
       repo: apache/incubator-openwhisk-runtime-python
   - provider: script
-    script: "./tools/travis/publish.sh openwhisk 2 latest && ./tools/travis/publish.sh openwhisk 3 latest && ./tools/travis/publish.sh openwhisk 3-ai latest && ./tools/travis/publish.sh openwhisk 3-loop latest"
+    script: "./tools/travis/publish.sh openwhisk 3 latest && ./tools/travis/publish.sh openwhisk 3-ai latest && ./tools/travis/publish.sh openwhisk 3-loop latest"
     on:
       branch: master
       repo: apache/incubator-openwhisk-runtime-python