Bump semver to 4.3.2 (close snowplow#625)

Author: mhadam

npm-shrinkwrap.json

@@ -11,17 +11,17 @@
     "sha1": "git://github.com/pvorb/node-sha1.git#v1.0.0"
   },
   "devDependencies": {
-    "js-base64": "2.1.9",
     "JSON": "1.0.0",
     "grunt": "0.4.5",
+    "grunt-aws": "0.6.2",
     "grunt-browserify": "5.0.0",
     "grunt-contrib-concat": "0.5.1",
     "grunt-lodash": "0.5.1",
-    "grunt-aws": "0.6.2",
     "grunt-yui-compressor": "git://github.com/snowplow/grunt-yui-compressor.git#0.4.0",
     "intern": "3.3.2",
+    "js-base64": "2.1.9",
     "lodash-cli": "3.10.1",
-    "semver": "2.2.1"
+    "semver": "4.3.2"
   },
   "contributors": [
     "Alex Dean",