chore(build): Run semantic release on latest node (#37)

When running the build on Node 6, we only have NPM 3, which doesn't have `npx`. So by adding the deploy `on` filter to run `semantic-release` on the latest node version, we won't try to even run it on Node 6.

BREAKING CHANGE: We need to trigger a version bump after taking over the package. Because #33 was just a `chore()`, `semantic-release` assumed there was nothing to release.

.travis.yml

@@ -12,8 +12,10 @@ script: yarn run validate
 before_deploy: yarn run build
 
 # Using semantic-release, deploy a new version of the library
-# We're running multiple node jobs so travis-deploy-once ensures
-# that it only tries to deploy once.
+# We're running multiple node jobs so running on latest Node
+# version
 deploy:
   provider: script
-  script: npx travis-deploy-once "npx semantic-release"
+  script: npx semantic-release
+  on:
+    node: "node"