Use version 6

chriseth · web-flow · commit 99b00c75cc4f · 2017-02-13T18:02:10.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -105,8 +105,8 @@ matrix:
           services:
               - docker
           before_install:
-              - nvm install
-              - nvm use
+              - nvm install 6
+              - nvm use 6
               - docker pull trzeci/emscripten:sdk-tag-1.35.4-64bit
           env:
               - SOLC_EMSCRIPTEN=On
