added /etc/feroxbuster as a valid config location

updated .deb to install the example config at /etc/feroxbuster
version bumped to 0.2.1

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "feroxbuster"
-version = "0.2.0"
+version = "0.2.1"
 authors = ["Ben 'epi' Risher <epibar052@gmail.com>"]
 license = "MIT"
 edition = "2018"
@@ -46,4 +46,8 @@ panic = 'abort'
 [package.metadata.deb]
 section = "utility"
 license-file = ["LICENSE", "4"]
-conf-files = ["~/.config/feroxbuster/ferox-config.toml"]
+conf-files = ["/etc/feroxbuster/ferox-config.toml"]
+assets = [
+    ["target/release/feroxbuster", "/usr/bin/", "755"],
+    ["ferox-config.toml.example", "/etc/feroxbuster/ferox-config.toml", "644"],
+]

README.md

@@ -97,6 +97,7 @@ After setting built-in default values, any values defined in a `ferox-config.tom
 built-in defaults.  
 
 `feroxbuster` searches for `ferox-config.toml` in the following locations (in the order shown):
+- `/etc/feroxbuster/`
 - `CONFIG_DIR/ferxobuster/`
 - The same directory as the `feroxbuster` executable
 - The user's current working directory

src/config.rs

@@ -233,6 +233,7 @@ impl Configuration {
     /// built-in defaults.
     ///
     /// `ferox-config.toml` can be placed in any of the following locations (in the order shown):
+    /// - `/etc/feroxbuster/`
     /// - `CONFIG_DIR/ferxobuster/`
     /// - The same directory as the `feroxbuster` executable
     /// - The user's current working directory
@@ -255,10 +256,15 @@ impl Configuration {
         // actually specified in the config file
         //
         // search for a config using the following order of precedence
+        //   - /etc/feroxbuster/
         //   - CONFIG_DIR/ferxobuster/
         //   - same directory as feroxbuster executable
         //   - current directory
 
+        // merge a config found at /etc/feroxbuster/ferox-config.toml
+        let config_file = PathBuf::new().join("/etc/feroxbuster").join(DEFAULT_CONFIG_NAME);
+        Self::parse_and_merge_config(config_file, &mut config);
+
         // merge a config found at ~/.config/feroxbuster/ferox-config.toml
         if let Some(config_dir) = dirs::config_dir() {
             // config_dir() resolves to one of the following