fix img src resolution with compiler beta.6

Author: yyx990803

lib/template-compiler.js

@@ -9,20 +9,25 @@ var options = {
   modules: [{
     postTransformNode (el) {
       if (el.tag === 'img') {
-        el.staticAttrs && el.staticAttrs.some(rewrite)
+        el.attrs && el.attrs.some(rewrite)
       }
     }
   }]
 }
 
 function rewrite (attr) {
   if (attr.name === 'src') {
-    var firstChar = attr.value.charAt(1)
+    var value = attr.value
+    var isStatic = value.charAt(0) === '"' && value.charAt(value.length - 1) === '"'
+    if (!isStatic) {
+      return
+    }
+    var firstChar = value.charAt(1)
     if (firstChar === '.' || firstChar === '~') {
       if (firstChar === '~') {
-        attr.value = '"' + attr.value.slice(2)
+        value = '"' + value.slice(2)
       }
-      attr.value = `require(${attr.value})`
+      attr.value = `require(${value})`
     }
     return true
   }

package.json

@@ -40,7 +40,7 @@
     "source-map": "^0.5.6",
     "vue-hot-reload-api": "^2.0.1",
     "vue-style-loader": "^1.0.0",
-    "vue-template-compiler": "^2.0.0-alpha.8"
+    "vue-template-compiler": "^2.0.0-beta.6"
   },
   "peerDependencies": {
     "css-loader": "^0.23.1"