update drone ci to compress svg and js files

.drone.yml

@@ -3,6 +3,13 @@ type: docker
 name: default
 
 steps:
+-   name: compress
+    image: node
+    commands:
+    - npm install uglify-js svgo -g
+    - for i in js/*.js; do uglifyjs -c -m -o $i -- $i; done
+    - for i in $(find . -name "*.svg"); do svgo $i -o $i; done
+
 -   name: publish
     image: appleboy/drone-scp
     settings: