Add automatic backup of previous configuration

public/hackatime/setup.ps1

@@ -1,7 +1,12 @@
 try {
     # Create config file with API settings
     $configPath = "$env:USERPROFILE\.wakatime.cfg"
-    
+    # If config exists, backup
+    if (Test-Path $configPath) {
+        Write-Host "[INFO] Config file already exists, moving into ~/.wakatime.cfg.bak"
+        Move-Item -Path $configPath -Destination "$configPath.bak"
+    }
+
     @"
 [settings]
 api_url = $env:HACKATIME_API_URL

public/hackatime/setup.sh

@@ -1,6 +1,12 @@
 #!/bin/bash
 set -e
 
+# If config exists, backup
+if [ -f ~/.wakatime.cfg ]; then
+    echo "[INFO] Config file already exists, moving into ~/.wakatime.cfg.bak"
+    mv ~/.wakatime.cfg ~/.wakatime.cfg.bak
+fi
+
 # Create or update config file
 cat > ~/.wakatime.cfg << EOL
 [settings]
@@ -46,4 +52,4 @@ if [ "$http_code" = "200" ] || [ "$http_code" = "202" ]; then
 else
   echo -e "\nError sending heartbeat: $body"
   exit 1
-fi 
+fi