Bump node-pre-gyp to v0.15.0

Closes #1599

Author: zbjornson

CHANGELOG.md

@@ -19,6 +19,7 @@ project adheres to [Semantic Versioning](http://semver.org/).
 * Fix to compile without JPEG support (#1593).
 * Fix compile errors with cairo
 * Fix Image#complete if the image failed to load.
+* Upgrade node-pre-gyp to v0.15.0 to use latest version of needle to fix error when downloading prebuilds.
 
 2.6.1
 ==================

package.json

@@ -49,7 +49,7 @@
   "types": "types/index.d.ts",
   "dependencies": {
     "nan": "^2.14.0",
-    "node-pre-gyp": "^0.11.0",
+    "node-pre-gyp": "^0.15.0",
     "simple-get": "^3.0.3"
   },
   "devDependencies": {