adding 5.0.6 in podspec

Author: ken

TMTumblrSDK.podspec.json

@@ -1,11 +1,11 @@
 {
   "name": "TMTumblrSDK",
-  "version": "5.0.5",
+  "version": "5.0.6",
   "summary": "An unopinionated and flexible library for easily integrating Tumblr data into your iOS or OS X application.",
   "homepage": "https://github.com/tumblr/TMTumblrSDK",
   "source": {
     "git": "https://github.com/tumblr/TMTumblrSDK.git",
-    "tag": "5.0.5"
+    "tag": "5.0.6"
   },
   "license": {
     "type": "Apache 2.0",