ignore catboost_info folder

relates to #1448

Author: jakimowb

.gitignore

@@ -53,3 +53,6 @@ scripts/changelog/fetch_issues.bat
 scripts/changelog/fetch_issues.txt
 scripts/changelog/fetch_releases.txt
 scripts/changelog/ISSUES.md
+
+# CatBoost training logs
+catboost_info/