changed filename extension to .log as json can operate on .log file

config.yml.example

@@ -45,7 +45,7 @@ auth_file: "/home/git/.ssh/authorized_keys"
 
 # Log file.
 # Default is gitlab-shell.json in the root directory.
-# log_file: "/home/git/gitlab-shell/gitlab-shell.json"
+# log_file: "/home/git/gitlab-shell/gitlab-shell.log"
 
 # Log level. INFO by default
 log_level: INFO

internal/config/config.go

@@ -57,7 +57,7 @@ type Config struct {
 // The defaults to apply before parsing the config file(s).
 var (
 	DefaultConfig = Config{
-		LogFile:   "gitlab-shell.json",
+		LogFile:   "gitlab-shell.log",
 		LogFormat: "json",
 		Server:    DefaultServerConfig,
 		User:      "git",