Add semver as hard dependency

Author: brianc

package.json

@@ -24,12 +24,12 @@
     "packet-reader": "0.2.0",
     "pg-connection-string": "0.1.3",
     "pg-types": "1.6.0",
-    "pgpass": "0.0.3"
+    "pgpass": "0.0.3",
+    "semver": "^4.1.0"
   },
   "devDependencies": {
     "async": "0.9.0",
-    "jshint": "2.5.2",
-    "semver": "~3.0.1"
+    "jshint": "2.5.2"
   },
   "minNativeVersion": "1.5.0",
   "scripts": {