Update dependencies and bump to 0.4.3

package.json

@@ -1,6 +1,6 @@
 {
   "name": "gulp-shell",
-  "version": "0.4.2",
+  "version": "0.4.3",
   "description": "A handy command line interface for gulp",
   "main": "index.js",
   "scripts": {
@@ -24,7 +24,7 @@
   },
   "homepage": "https://github.com/sun-zheng-an/gulp-shell",
   "devDependencies": {
-    "chai": "~2.3.0",
+    "chai": "~3.2.0",
     "coveralls": "~2.11.2",
     "eslint": "~1.3.0",
     "gulp": "~3.9.0",
@@ -33,9 +33,9 @@
     "mocha-lcov-reporter": "0.0.2"
   },
   "dependencies": {
-    "async": "~1.2.0",
+    "async": "~1.4.2",
     "gulp-util": "~3.0.5",
-    "lodash": "~3.9.3",
-    "through2": "~0.6.5"
+    "lodash": "~3.10.1",
+    "through2": "~2.0.0"
   }
 }