Change index to i in for loop snippet (#3010)

diff --git a/snippets/go.json b/snippets/go.json
index 48719d8..301ead3 100644
--- a/snippets/go.json
+++ b/snippets/go.json
@@ -62,7 +62,7 @@
 		},
 		"for statement": {
 			"prefix": "for",
-			"body": "for ${1:index} := 0; $1 < ${2:count}; $1${3:++} {\n\t$0\n}",
+			"body": "for ${1:i} := 0; $1 < ${2:count}; $1${3:++} {\n\t$0\n}",
 			"description": "Snippet for a for loop"
 		},
 		"for range statement": {