refactor(logger): Use ISO8601 timestamp

logger.sh

@@ -1,11 +1,11 @@
 #!/bin/sh
 
 getTimeStamp() {
-  (date +%F" "%T)
+  (date -u +"%Y-%m-%dT%H:%M:%SZ")
 }
 
 uppercase() {
-    echo "$1" | tr '[:lower:] [:upper:]'
+  echo "$1" | tr '[:lower:] [:upper:]'
 }
 
 # $1: message, $2: level, $3: status, $4: operation, $5: code