Refactoring loading of config file

- let `HuskConfig::load` return a `Result` instead of an `Option`.
- added comments

src/config.rs

@@ -2,10 +2,13 @@
 // Parsing the config file
 //
 
+use anyhow;
 use std::fs;
 use std::sync::{Arc, Mutex};
 use serde_derive::Deserialize;
 
+use crate::types::errors::HuskError;
+
 #[derive(Deserialize, Debug, Clone)]
 pub struct HuskConfig {
     pub connection: String,
@@ -15,20 +18,18 @@ pub struct HuskConfig {
 
 impl HuskConfig {
 
-    pub fn load(path: &String) -> Option<Self> {
+    pub fn load(path: &String) -> anyhow::Result<Self> {
         match fs::read_to_string(path) {
             Ok(data) => {
                 match toml::from_str(data.as_str()) {
-                    Ok(configuration) => Some(configuration),
+                    Ok(configuration) => Ok(configuration),
                     Err(e) => {
-                        eprintln!("Error while parsing config file: {:?}", e);
-                        None
+                        Err(HuskError::ConfigFileParseError(e.to_string()).into())
                     }
                 }
             },
             Err(e) => {
-                eprintln!("Error while reading config file: {:?}", e);
-                None
+                Err(HuskError::ConfigFileOpenError(e.to_string()).into())
             }
         }
     }