polish: improve template compiler version mismatch warning (#9738)

Author: mcmillenb

packages/vue-template-compiler/index.js

@@ -5,10 +5,12 @@ try {
 var packageName = require('./package.json').name
 var packageVersion = require('./package.json').version
 if (vueVersion && vueVersion !== packageVersion) {
+  var vuePath = require.resolve('vue')
+  var packagePath = require.resolve('./package.json')
   throw new Error(
     '\n\nVue packages version mismatch:\n\n' +
-    '- vue@' + vueVersion + '\n' +
-    '- ' + packageName + '@' + packageVersion + '\n\n' +
+    '- vue@' + vueVersion + ' (' + vuePath + ')\n' +
+    '- ' + packageName + '@' + packageVersion + ' (' + packagePath + ')\n\n' +
     'This may cause things to work incorrectly. Make sure to use the same version for both.\n' +
     'If you are using vue-loader@>=10.0, simply update vue-template-compiler.\n' +
     'If you are using vue-loader@<10.0 or vueify, re-installing vue-loader/vueify should bump ' + packageName + ' to the latest.\n'