Docs: Update expired link

Referer: https://github.com/Percona-Lab/ontime-airline-performance/commit/0ee61fed7fc52b794297b45a0c9bc9621e38720b

docs/en/getting_started/example_datasets/ontime.md

@@ -11,11 +11,11 @@ This dataset can be obtained in two ways:
 Downloading data:
 
 ```bash
-for s in `seq 1987 2017`
+for s in `seq 1987 2018`
 do
 for m in `seq 1 12`
 do
-wget http://transtats.bts.gov/PREZIP/On_Time_On_Time_Performance_${s}_${m}.zip
+wget https://transtats.bts.gov/PREZIP/On_Time_Reporting_Carrier_On_Time_Performance_1987_present_${s}_${m}.zip
 done
 done
 ```