chore(travis): move npm ci to install task (#424)

* chore(travis): move npm ci to install task

* chore: trigger new build

* chore: upgrade Node.js for Appveyor to 8

* chore: remove redundanct npm install command

Author: DanielRuf

.appveyor.yml

@@ -5,7 +5,7 @@ version: "{build}"
 environment:
   fast_finish: true
   matrix:
-    - nodejs_version: "6"
+    - nodejs_version: "8"
       platform: x86
 
 build: off

.travis.yml

@@ -43,10 +43,12 @@ before_install:
   - DISPLAY=":0.0" SSH_ASKPASS="/tmp/askpass" setsid ssh-add /tmp/git_deploy_key </dev/null
 
   - '[[ $(node -v) =~ ^v9.*$ ]] || npm install -g npm@latest' # skipped when using node 9
-  - npm install -g greenkeeper-lockfile@1
+
+install:
   - npm ci
   - npm install -g codecov
   - npm install -g eslint
+  - npm install -g greenkeeper-lockfile@1
 
 before_script: greenkeeper-lockfile-update
 after_script: greenkeeper-lockfile-upload