feat(createHttpClient): Enable axios proxy

Author: Khaledgarbaya

lib/contentful-management.js

@@ -13,7 +13,7 @@ import createContentfulApi from './create-contentful-api'
 
 /**
  * @typedef {ContentfulManagement} ContentfulManagement
- * @property {function(params: {accessToken: string, insecure?: boolean, host?: string, hostUpload?: string, httpAgent?: Object, httpsAgent?: Object, headers?: Object}): ClientAPI} createClient - Create a client instance, this is the entry point to the library
+ * @property {function(params: {accessToken: string, insecure?: boolean, host?: string, hostUpload?: string, httpAgent?: Object, httpsAgent?: Object, headers?: Object, proxy?:Object}): ClientAPI} createClient - Create a client instance, this is the entry point to the library
  *
  * @example
  * // require contentful-management

package.json

@@ -55,7 +55,7 @@
   ],
   "dependencies": {
     "axios": "~0.15.3",
-    "contentful-sdk-core": "^3.8.3",
+    "contentful-sdk-core": "^3.9.0",
     "es6-promise": "^4.0.5",
     "lodash": "^4.17.4"
   },