Update .travis.yml

.travis.yml

@@ -5,9 +5,9 @@ node_js: '10'
 before_install:
   - sudo apt update
   - sudo apt install build-essential
-  - sudo snap refresh
   - sudo apt install snapd
   - sudo snap install --classic snapcraft
+  - sudo snap refresh
   - sudo apt-get install --no-install-recommends -y libopenjp2-tools
   - sudo apt-get install --no-install-recommends -y snapcraft
   - sudo apt-get install build-essential clang libdbus-1-dev libgtk-3-dev libnotify-dev libgnome-keyring-dev libgconf2-dev libasound2-dev libcap-dev libcups2-dev libxtst-dev libxss1 libnss3-dev gcc-multilib g++-multilib curl gperf bison python-dbusmock openjdk-8-jre