Update .travis.yml to use build stages

.travis.yml

@@ -1,27 +1,32 @@
 language: scala
-scala: 2.12.4
+scala: 2.12.6
 jdk: oraclejdk8
 sudo: false
 dist: trusty
 
+stages:
+  - name: test
+  - name: release
+    if: (branch = master AND type = push) OR (tag IS present)
+
+
 env:
   global:
     - TRAVIS_NODE_VERSION="8"
     - TRAVIS_YARN_VERSION="1.3.2"
 
-matrix:
+jobs:
   include:
-    - script: sbt ci-test
-      env: CI_PUBLISH=true
-      deploy:
-        provider: script
-        script: bash bin/ci-publish.sh
-    - script: sbt ";^^$SCRIPTED_SBT_VERSION; scripted"
-      env: SCRIPTED_SBT_VERSION="0.13.17"
-    - script: sbt ";^^$SCRIPTED_SBT_VERSION; scripted"
-      env: SCRIPTED_SBT_VERSION="1.0.4"
-    - script: ./bin/scalafmt --test
-      env: SCALAFMT=true
+    - env: TEST="sbt test"
+      script: sbt ci-test
+    - env: SCRIPTED_SBT_VERSION="0.13.17"
+      script: sbt ";^^$SCRIPTED_SBT_VERSION; scripted"
+    - env: SCRIPTED_SBT_VERSION="1.2.1"
+      script: sbt ";^^$SCRIPTED_SBT_VERSION; scripted"
+    - env: TEST=scalafmt
+      script: ./bin/scalafmt --test
+    - stage: release
+      script: sbt ci-release
 
 cache:
   yarn: true