feat: update installation script URLs to use 'master' branch

- Change installation script URLs in release.yml, install.sh, and README.md
  to point to the 'master' branch instead of 'main'.
- Ensure consistency across documentation and installation instructions.

Author: ali-master

.github/workflows/release.yml

@@ -168,7 +168,7 @@ jobs:
           
           **One-line installer (recommended):**
           ```bash
-          curl -fsSL https://raw.githubusercontent.com/${{ github.repository }}/main/scripts/install.sh | sh
+          curl -fsSL https://raw.githubusercontent.com/${{ github.repository }}/master/scripts/install.sh | sh
           ```
           
           **Manual Downloads:**

README.md

@@ -34,7 +34,7 @@
 
 ```bash
 # Install latest version for your platform (auto-detects OS/arch)
-curl -fsSL https://raw.githubusercontent.com/ali-master/pingu/main/scripts/install.sh | sh
+curl -fsSL https://raw.githubusercontent.com/ali-master/pingu/master/scripts/install.sh | sh
 ```
 
 > **Note**: The installer automatically detects your operating system and CPU architecture, downloads the appropriate binary, and installs it to your system. It will try to install to `/usr/local/bin` (with sudo if needed) or fall back to `~/bin`.
@@ -79,7 +79,7 @@ $env:PATH += ";$PWD"
 
 ```bash
 # Run the installer again to upgrade to the latest version
-curl -fsSL https://raw.githubusercontent.com/ali-master/pingu/main/scripts/install.sh | sh
+curl -fsSL https://raw.githubusercontent.com/ali-master/pingu/master/scripts/install.sh | sh
 ```
 
 The installer will:

scripts/install.sh

@@ -3,7 +3,7 @@
 set -e
 
 # Pingu installer script
-# Usage: curl -fsSL https://raw.githubusercontent.com/ali-master/pingu/main/scripts/install.sh | sh
+# Usage: curl -fsSL https://raw.githubusercontent.com/ali-master/pingu/master/scripts/install.sh | sh
 
 REPO="ali-master/pingu"
 VERSION="latest"
@@ -420,4 +420,4 @@ elif [ "$OS_NAME" = "windows" ]; then
 fi
 
 print_color "$GREEN" "Happy pinging! ${PENGUIN}"
-echo ""
+echo ""