use babel loader to transpile svgs

IE and Edge had trouble loading the Human Connection network
because object spread operators were left in the minified code
using babel-loader for svgs (as suggested in the vue-svg-loader docs)
hopefully solves this issue

vue.config.js

@@ -32,7 +32,7 @@ module.exports = {
           loader: process.env.BUILD === 'library'
             ? require.resolve('./src/loader/docs-trim-loader.js')
             : require.resolve('./src/loader/docs-loader.js')
-        }
+        },
       ]
     },
     plugins: process.env.BUILD === 'library'
@@ -64,6 +64,9 @@ module.exports = {
     const svgRule = config.module.rule('svg')
     svgRule.uses.clear()
     svgRule
+      .use('babel-loader')
+      .loader('babel-loader')
+      .end()
       .use('vue-svg-loader')
       .loader('vue-svg-loader')
       .options({