if user.name is not set print unknown instead of crashing

Author: o2sh

Diff for: README.md

@@ -23,7 +23,7 @@ It automatically detects open source licenses from texts and provides the user w
 
 <img src="assets/kubernetes.png" align="right" height="240px">
 
-Onefetch can be configured via command-line flags to display exactly what you want, the you want it to: you can customize ASCII/Text formatting, disable info lines, ignore files & directories, etc. Read more about it [here](https://github.com/o2sh/onefetch/wiki/command-line-options).
+Onefetch can be configured via command-line flags to display exactly what you want, the you want it to: you can customize ASCII/Text formatting, disable info lines, ignore files & directories, etc; read more about it [here](https://github.com/o2sh/onefetch/wiki/command-line-options).
 
 As of now, onefetch supports more than 50 different programming languages; if your language of choice isn't supported: Open up an issue and support will be added. 
 

Diff for: src/onefetch/repo.rs

@@ -35,8 +35,12 @@ impl Repo {
 
     pub fn get_git_username(&self) -> Result<String> {
         let config = self.repo.config()?;
-        let username = config.get_entry("user.name")?;
-        Ok(username.value().unwrap_or("unknown").to_string())
+        let username = match config.get_entry("user.name") {
+            Ok(v) => v.value().unwrap_or("unknown").into(),
+            Err(_) => "unknown".into(),
+        };
+
+        Ok(username)
     }
 
     pub fn get_version(&self) -> Result<String> {