固定 package 版本，以防 ie8 下运行失败。

Author: dcw1123

package.json

@@ -7,27 +7,27 @@
     "url": "http://easemob.com/"
   },
   "devDependencies": {
-    "autoprefixer": "^7.1.2",
-    "commander": "2.9.0",
-    "css-loader": "^0.28.4",
-    "cssnano": "^3.10.0",
-    "debug": "2.2.0",
-    "expose-loader": "^0.7.3",
-    "express": "4.14.0",
-    "extract-loader": "^0.1.0",
-    "file-loader": "^0.11.2",
-    "html-loader": "^0.4.5",
-    "html-webpack-plugin": "^2.29.0",
-    "http-proxy": "1.14.0",
-    "i18next-loader": "0.0.6",
-    "ie8-style-loader": "0.0.1",
+    "autoprefixer": "=7.1.2",
+    "commander": "=2.9.0",
+    "css-loader": "=0.28.4",
+    "cssnano": "=3.10.0",
+    "debug": "=2.2.0",
+    "expose-loader": "=0.7.3",
+    "express": "=4.14.0",
+    "extract-loader": "=0.1.0",
+    "file-loader": "=0.11.2",
+    "html-loader": "=0.4.5",
+    "html-webpack-plugin": "=2.29.0",
+    "http-proxy": "=1.14.0",
+    "i18next-loader": "=0.0.6",
+    "ie8-style-loader": "=0.0.1",
     "node-sass": "^4.9.0",
-    "postcss-loader": "^2.0.6",
-    "raw-loader": "^0.5.1",
-    "sass-loader": "^4.1.1",
-    "string-replace-loader": "^1.3.0",
+    "postcss-loader": "=2.0.6",
+    "raw-loader": "=0.5.1",
+    "sass-loader": "=4.1.1",
+    "string-replace-loader": "=1.3.0",
     "webpack": "=1.13.2",
-    "yargs": "^8.0.2"
+    "yargs": "=8.0.2"
   },
   "scripts": {
     "build": "KEY_PATH=webim webpack --production",
@@ -38,8 +38,8 @@
   },
   "dependencies": {
     "easemob-websdk": "=1.4.6",
-    "es6-promise": "^4.1.1",
+    "es6-promise": "=4.1.1",
     "moment": "=2.18.1",
-    "underscore": "^1.8.3"
+    "underscore": "=1.8.3"
   }
 }