build(semantic-release): use node 6.x

mediumTaj · mediumTaj · commit a30dd696549b · 2018-08-16T16:07:07.000-05:00
diff --git a/.travis.yml b/.travis.yml
@@ -7,7 +7,7 @@ cache:
     - ./Unity
 before_install:
 - chmod a+x ./Travis/installUnity.sh
-- npm install npm@latest -g
+- npm install -g npm@6.x
 install:
 - ./Travis/installUnity.sh
 before_script:
