fixing dependency issue with pg-query-stream.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "pg-promise",
-  "version": "6.3.7",
+  "version": "6.3.8",
   "description": "Promises interface for PostgreSQL",
   "main": "lib/index.js",
   "typings": "typescript/pg-promise.d.ts",
@@ -41,20 +41,20 @@
   },
   "dependencies": {
     "manakin": "0.4",
-    "pg": "^6.4.1",
-    "pg-minify": "^0.5.1",
+    "pg": "6.4.1",
+    "pg-minify": "0.5.2",
     "spex": "1.2"
   },
   "devDependencies": {
-    "@types/node": "^8.0.19",
-    "JSONStream": "1.3",
+    "@types/node": "8.0.20",
+    "JSONStream": "1.3.1",
     "bluebird": "3.5",
     "coveralls": "2.11",
-    "eslint": "^4.4.0",
+    "eslint": "4.4.1",
     "istanbul": "0.4",
     "jasmine-node": "1.14",
-    "jsdoc": "^3.5.4",
-    "pg-query-stream": "1.x",
-    "typescript": "^2.4.2"
+    "jsdoc": "3.5.4",
+    "pg-query-stream": "1.0.0",
+    "typescript": "2.4.2"
   }
 }