Remove telegraf 1.3 from the manifest file

Author: jsternberg

telegraf/manifest.json

@@ -1,6 +1,6 @@
 {
   "name": "telegraf",
-  "versions": ["1.3", "1.4", "1.5"],
+  "versions": ["1.4", "1.5"],
   "architectures": [
     "amd64",
     "arm32v7",